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  • 1.
    Faulkner, R
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Wang, MQ
    Dunne, P
    Arnesen, Arne
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Hallin, R
    O'Sullivan, G
    Observation of (3d4p -> 3d4d) and (3d4d -> 3d4f) transitions in the vacuum ultraviolet spectra of calcium-like MnVI, FeVII and CoVIII2001In: JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, ISSN 0953-4075, Vol. 34, no 4, p. 593-603Article in journal (Refereed)
    Abstract [en]

    An analysis of the spectra of calcium-like Mn VI, Fe VII and Co VIII in the 550-1375 Angstrom wavelength region is reported following observations involving collision-based spectroscopy of ion-rare-gas collisions in an ion beam from an ECR ion source. The

  • 2. G. N. Gerasimov, Gennady
    et al.
    Krylov, Boris
    Hallin, Reinhold
    Morozov, Andrei
    Arnesen, Arne
    Heijkenskjöld, Filip
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
    Vacuum ultraviolet spectra of heteronuclear dimers of inert gases in a direct-current discharge2003In: Optics and Spectroscopy, Vol. 94, p. 374–383-Article in journal (Refereed)
  • 3. Gerasimov, G
    et al.
    Krylov, B
    Loginov, A
    Zvereva, G
    Hallin, R
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Arnesen, Arne
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    The vacuum ultraviolet spectrum of krypton and xenon excimers excited in a cooled dc discharge1998In: APPLIED PHYSICS B-LASERS AND OPTICS, ISSN 0946-2171, Vol. 66, no 1, p. 81-90Article in journal (Refereed)
    Abstract [en]

    We present results of an experimental and theoretical study of the VUV spectra of krypton and xenon excimers excited by a de discharge in a capillary tube cooled by liquid nitrogen. The studied spectral regions of 115-170nm and 140-195 nm for krypton and

  • 4. Gerasimov, G N
    et al.
    Hallin, R
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Maleshin, M N
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Kuhn, T K
    Sundberg, P
    Radiation amplification by a hydrogen plasma2002In: Optics and Spectroscopy, Vol. 92, no 3, p. 475-480Article in journal (Refereed)
  • 5. Gerasimov, G N
    et al.
    Krylov, B E
    Hallin, R
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Morozov, A O
    Arnesen, Arne
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Stimulated emission of inert gas mixtures in the VUV range: Optics and Spectroscopy2002In: Optics and Spectroscopy: Optics and Spectroscopy, Vol. 92, no 2, p. 290-297Article in journal (Refereed)
  • 6. Gerasimov, G N
    et al.
    Krylov, B E
    Hallin, R
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Morozov, A O
    Arnesen, Arne
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Vacuum ultraviolet spectra of heteronuclear dimers of inert gases in a direct-current discharge: Optics and Spectroscopy2003In: Optics and Specroscopy: Optics and Specroscopy, Vol. 94, no 3, p. 374-383Article in journal (Refereed)
  • 7.
    Gerasimov, G N
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Krylov, B E
    Kononova, O N
    Hallin, Reinhold
    Department of Physics and Materials Science, Physics II.
    Morozov, Andrei
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Arnesen, Arne
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Zhukova, E V
    The effect of short-wavelength discharge radiation on the transmission of a magnesium fluoride window2002In: Journal of Optical Technology: Journal of Optical Technology, Vol. 69, no 3, p. 158-162Article in journal (Refereed)
  • 8.
    Heijkenskjöld, Filip
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Experimental techniques and their applications in laser spectroscopy2004Licentiate thesis, comprehensive summary (Other academic)
  • 9.
    Heijkenskjöld, Filip
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
    Experimental Techniques for Studies in Atomic & Molecular Physics2008Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis is based on a selection of six different experimental techniques used for studies in atomic and molecular physics. The techniques analysed in the thesis are compared to find similarities in strategies and ways to avoid sources of error.

    Paper 1 deals with collision based spectroscopy with 60 keV Xe6+ ions on sodium and argon gas targets. Information on energy of Rydberg states in Xe5+ is unveiled by optical spectroscopy in the wavelength range from vacuum ultraviolet (VUV) to visible. In paper 2, the fast ion-beam laser spectroscopy (FIBLAS) is adapted for measuring hyperfine structure of barium isotopes in an isotopically pure ion-beam. This techniques involves changing the isotope during the measurement to minimize sources of error in measurement and enhance the signal from lesser abundant isotopes. The FIBLAS technique is used in paper 3 to study samarium ions. The ions are optically pumped and the recorded optical nutation is used to measure transition probabilities. This technique eludes the difficulties inherent in relative intensity measurements of all the radiative transitions from an excited state. In Paper 4, optical emission spectroscopy is used in the VUV region to study noble gas mixture discharges. The source of the emission bands near the resonance lines of krypton and xenon are found to be heteronuclear dimers. In paper 5, radiation from a pulsed argon plasma with admixture of nitrogen is studied with time resolved spectroscopy in the VUV and ultraviolet wavelength ranges to investigate the mechanism of energy transport. A metastable state of atomic argon is found to be an important source of energy to many radiative processes. In Paper 6, photoelectron spectroscopy (PES) on thiophene, on 3-bromothiophene and on 3,4-dibromothiophene using time-of-flight photoelectron-photoelectron coincidence technique and conventional PES to investigate the onset of double ionisation compared to the onset of single ionisation in molecules.

    List of papers
    1. Collision-based spectroscopy of Xe VI Rydberg states
    Open this publication in new window or tab >>Collision-based spectroscopy of Xe VI Rydberg states
    Show others...
    1996 In: J. Opt. Soc. Am., Vol. 13, p. 2715-2719Article in journal (Refereed) Published
    Identifiers
    urn:nbn:se:uu:diva-97567 (URN)
    Available from: 2008-09-18 Created: 2008-09-18 Last updated: 2015-10-26Bibliographically approved
    2. Isotope shifts and hyperfine structure of 134 – 138Ba by fast ion beam-laser spectroscopy
    Open this publication in new window or tab >>Isotope shifts and hyperfine structure of 134 – 138Ba by fast ion beam-laser spectroscopy
    1993 In: J . Phys. B, Vol. 26, p. 4289-4299Article in journal (Refereed) Published
    Identifiers
    urn:nbn:se:uu:diva-97568 (URN)
    Available from: 2008-09-18 Created: 2008-09-18 Last updated: 2015-10-26Bibliographically approved
    3. Vacuum ultraviolet spectra of heteronuclear dimers of inert gases in a direct-current discharge
    Open this publication in new window or tab >>Vacuum ultraviolet spectra of heteronuclear dimers of inert gases in a direct-current discharge
    Show others...
    2003 In: Optics and Spectroscopy, Vol. 94, p. 374–383-Article in journal (Refereed) Published
    Identifiers
    urn:nbn:se:uu:diva-97569 (URN)
    Available from: 2008-09-18 Created: 2008-09-18 Last updated: 2015-10-26Bibliographically approved
    4. Transition probabilities in Sm II via optical nutation
    Open this publication in new window or tab >>Transition probabilities in Sm II via optical nutation
    Show others...
    1993 (English)In: Z. Phys. D, Vol. 28, p. 285-288Article in journal (Refereed) Published
    National Category
    Physical Sciences
    Identifiers
    urn:nbn:se:uu:diva-97570 (URN)
    Available from: 2008-09-18 Created: 2008-09-18 Last updated: 2015-10-26Bibliographically approved
    5. Channels of energy transfer to atomic nitrogen in excited argon–nitrogen mixtures
    Open this publication in new window or tab >>Channels of energy transfer to atomic nitrogen in excited argon–nitrogen mixtures
    Show others...
    2002 In: J. Phys. B, Vol. 35, p. 4257–4270-Article in journal (Refereed) Published
    Identifiers
    urn:nbn:se:uu:diva-97571 (URN)
    Available from: 2008-09-18 Created: 2008-09-18 Last updated: 2015-10-26Bibliographically approved
    6. Double photoionisation of thiophene and bromine substituted thiophenes
    Open this publication in new window or tab >>Double photoionisation of thiophene and bromine substituted thiophenes
    Show others...
    2008 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 129, no 23, p. 234303-Article in journal (Refereed) Published
    Abstract [en]

    We report the double photoionization spectra of thiophene, 3-bromothiophene, and 3,4-dibromothiophene using a coincidence spectroscopy technique based on electron time-of-flight measurements. Spectra have been recorded between the onset and 40.814 eV using He IIα radiation. The He I photoelectron spectrum of 3,4-dibromothiophene has also been measured. All the spectra have been analyzed and interpreted in detail on the basis of theoretical simulations from accurate Green's function calculations.

    Keywords
    Green's function methods, molecule-photon collisions, organic compounds, photoelectron spectra, photoionisation, time of flight spectra
    National Category
    Physical Sciences
    Identifiers
    urn:nbn:se:uu:diva-97572 (URN)10.1063/1.3039082 (DOI)000261896700010 ()
    Available from: 2008-09-18 Created: 2008-09-18 Last updated: 2017-12-14Bibliographically approved
  • 10.
    Heijkenskjöld, Filip
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics.
    Lampan, våra ögons krycka2015In: Kosmos 2014 -2015, ISSN 0368-6213, Vol. 91, p. 19-28Article in journal (Other (popular science, discussion, etc.))
  • 11.
    Heijkenskjöld, Filip
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics.
    Edvardsson, Bengt
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Lundberg, Marcus
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Theoretical Chemistry.
    Aktiva studenter gör demonstrationsexperiment (2)2017Conference paper (Other academic)
    Abstract [sv]

    Aktiva studenter gör demonstrationsexperiment

    Filip Heijkenskjöld, Institutionen för fysik och astronomi avd. Fysikens didaktik

    Bengt Edvardsson, Institutionen för fysik och astronomi, avd. Astronomi

    Marcus Lundberg, Institutionen för kemi - Ångström, Teoretisk kemi

    Sammanfattning

    Projektet avser att aktivera studenterna och gör dem till deltagande aktörer i föreläsningarna genom att ge studenterna ansvar för att designa sina egna experiment som kan visa på centrala begrepp inom fysiken. Studenterna får använda ett mätverktyg (IOLab) för att enkelt kunna experimentera och samla in data. För information om IOLab se http://www.iolab.science

    Vi låter studenterna i kursen 1KB302, Fysik för kemister, ta ansvar för en del av undervisningen. De väljer själva ut vad de vill illustrera med experiment. Studenterna bidrar med var sitt ca 5 minuter långt demonstrationsexperiment och deltar i en efterföljande diskussion på 10 minuter. Efter godkänd insats får de en tentamensdel godkänd. Detta ökar studenternas engagemang och även kopplingen till andra kurser som studeras inom programmen.

  • 12. Kastberg, Anders
    et al.
    Villemoes, Petrine
    Arnesen, Arne
    Heijkenskjöld, Filip
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
    Langereis, Alexander
    Jungner, Peter
    Linneus, Staffan
    Transition probabilities in Sm II via optical nutation1993In: Z. Phys. D, Vol. 28, p. 285-288Article in journal (Refereed)
  • 13. Krylov, B
    et al.
    Gerasimov, G
    Morozov, A
    Arnesen, Arne
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Hallin, R
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Energy transfer studies in krypton-xenon mixtures excited in a cooled DC discharge2000In: EUROPEAN PHYSICAL JOURNAL D, ISSN 1434-6060, Vol. 8, no 2, p. 227-239Article in journal (Refereed)
    Abstract [en]

    The VUV spectrum of gaseous mixtures of krypton with a small amount of xenon added was investigated in the range 115-200 nm. The mixtures were excited in a capillary DC discharge where the capillary could be cooled by using liquid nitrogen. The mixed mole

  • 14. Krylov, B
    et al.
    Morozov, A
    Gerasimov, G
    Arnesen, Arne
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Hallin, Reinhold
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics II.
    Channels of energy transfer to atomic nitrogen in excited argon-nitrogen mixtures2002In: Journal of Physics B Atomic Molecular and Optical Physics: Journal of Physics B, Vol. 35, no 20, p. 4257-4270Article in journal (Refereed)
  • 15. Krylov, Boris
    et al.
    Morozov, Andrei
    Gerasimov, Gennady
    Arnesen, Arne
    Hallin, Reinhold
    Heijkenskjöld, Filip
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
    Channels of energy transfer to atomic nitrogen in excited argon–nitrogen mixtures2002In: J. Phys. B, Vol. 35, p. 4257–4270-Article in journal (Refereed)
  • 16. LARSSON, MO
    et al.
    GONZALEZ, AM
    HALLIN, R
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    HUTTON, R
    LANGEREIS, A
    NYSTROM, B
    OSULLIVAN, G
    WANNSTROM, A
    WAVELENGTHS AND ENERGY-LEVELS OF XE-VII AND XE-VIII OBTAINED BY COLLISION-BASED SPECTROSCOPY: WAVELENGTHS AND ENERGY-LEVELS OF XE-VII AND XE-VIII OBTAINED BY COLLISION-BASED SPECTROSCOPY1995In: PHYSICA SCRIPTA: PHYSICA SCRIPTA, ISSN 0281-1847, Vol. 51, no 1, p. 69-75Article in journal (Other scientific)
    Abstract [en]

    The Xe VII and Xe VIII spectra have been investigated by collision-based spectroscopy. The radiation emitted following electron capture by 10q keV Xe-q+ ions (q = 6-8) impinging on a He (Ar) gas target has, with some exceptions, been recorded in the 350-8

  • 17. Larsson, MO
    et al.
    Gonzalez, AM
    Hallin, R
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Nystrom, B
    OSullivan, G
    Weber, C
    Wannstrom, A
    Wavelengths and energy levels of Xe V and Xe VI obtained by collision-based spectroscopy: Wavelengths and energy levels of Xe V and Xe VI obtained by collision-based spectroscopy1996In: PHYSICA SCRIPTA: PHYSICA SCRIPTA, Vol. 53, no 3, p. 317-324Article in journal (Refereed)
    Abstract [en]

    We have utilized collision-based spectroscopy to investigate the spectra of Xe V and Xe VI. The radiation emitted following electron capture by 50 keV Xe5+ and 60 keV Xe6+ ions impinging on a He (Ar) gas target has been recorded in the 350-6000 (1200-2500

  • 18. Larsson, MO
    et al.
    Wannstrom, A
    Wang, M
    Arnesen, Arne
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Langereis, A
    Nystrom, B
    McCullough, RW
    Cederquist, H
    Photon-emission studies of slow C4+-Ne collisions1997In: PHYSICAL REVIEW A, ISSN 1050-2947, Vol. 55, no 3, p. 1911-1921Article in journal (Refereed)
    Abstract [en]

    We present absolute term- and level-selective cross sections for specific single- and double-electron capture processes in slow (16 keV) C4+-Ne collisions. The results are deduced through a combined analysis of earlier translational energy-gain data and t

  • 19.
    Linusson, Per
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Soft X-Ray Physics.
    Stenrup, Michael
    Larson, Åsa
    Andersson, Egil
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Soft X-Ray Physics.
    Heijkenskjöld, Filip
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Soft X-Ray Physics.
    Andersson, Pernilla
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
    Eland, John H. D.
    Karlsson, Leif
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Soft X-Ray Physics.
    Rubensson, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Soft X-Ray Physics.
    Feifel, Raimund
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Soft X-Ray Physics.
    Double photoionization of alcohol molecules2009In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 80, no 3, p. 032516-Article in journal (Refereed)
    Abstract [en]

    The double valence photoionization spectra of methanol, ethanol, and n-propyl alcohol have been recorded using a time-of-flight photoelectron-photoelectron coincidence technique. The spectra show a well-defined onset followed by broad rounded bands. The lowest vertical double ionization energies have been determined for all molecules and are found to be 32.1, 29.6, and 28.2 eV, respectively. These energies have been applied along with single ionization energies from conventional photoelectron spectra to investigate a recently derived rule of thumb for determination of the lowest double ionization energy in molecules. Many-electron ab initio calculations have been performed on the dicationic ground states in good agreement with the experimental values. For methanol, also excited dicationic states have been calculated up to about 40 eV and used for a detailed interpretation of the experimental spectrum.

  • 20. NYSTROM, B
    et al.
    HUTTON, R
    HULDT, S
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    LANGEREIS, A
    LARSSON, MO
    WANG, M
    WANNSTROM, A
    PHOTON SPECTROSCOPY OF SLOW HE-Q++HE (Q=1,2) COLLISIONS1995In: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, ISSN 0168-583X, Vol. 98, no 1-4, p. 62-64Article in journal (Refereed)
    Abstract [en]

    Photon emission following slow ion-atom collisions has been observed for the collision systems He-q+ + He(q = 1,2) at the energy 10 keV q(-1). In particular relative photon emission cross sections for the 1s(2) S-1(0)-1snp P-1(1) series in neutral helium

  • 21. Nystrom, B
    et al.
    Hutton, R
    Huldt, S
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Larsson, MO
    Wannstrom, A
    Photon spectroscopy of slow He2++He collisions1997In: PHYSICA SCRIPTA, ISSN 0281-1847, Vol. T73, p. 212-213Article in journal (Refereed)
    Abstract [en]

    Photon emission following slow ion-atom collisions has been observed for the collision system He2+ + He. The energy of the incoming beam of helium ions was varied between 10 keV and 35 keV. In particular, the velocity dependent relative photon emission cr

  • 22.
    Tibbelin, Julius
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC.
    Wallner, Andreas
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC.
    Emanuelsson, Rikard
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC, Physical Organic Chemistry.
    Heijkenskjöld, Filip
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Rosenberg, Martin
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC.
    Yamazaki, Kaoru
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC.
    Nauroozi, Djawed
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Molecular Biomimetics.
    Karlsson, Leif
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Feifel, Raimund
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Pettersson, Roland
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC, Analytical Chemistry.
    Baumgartner, Judith
    Ott, Sascha
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Molecular Biomimetics.
    Ottosson, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC, Synthetical Organic Chemistry.
    1,4-Disilacyclohexa-2,5-diene: a molecular building block that allows for remarkably strong neutral cyclic cross-hyperconjugation2014In: Chemical Science, ISSN 2041-6520, Vol. 5, no 1, p. 360-371Article in journal (Refereed)
    Abstract [en]

    2,3,5,6-Tetraethyl-1,4-disilacyclohexa-2,5-dienes with either four chloro (1a), methyl (1b), or trimethylsilyl (TMS) (1c) substituents at the two silicon atoms were examined in an effort to design rigid compounds with strong neutral cross-hyperconjugation between pi- and sigma-bonded molecular segments arranged into a cycle. Remarkable variations in the lowest electronic excitation energies, lowest ionization energies, and the first oxidation potentials were observed upon change of substituents, as determined by gas phase ultraviolet (UV) absorption spectroscopy, ultraviolet photoelectron spectroscopy (UPS), and cyclic voltammetry. A particularly strong neutral cyclic cross-hyperconjugation was observed in 1c. Its lowest electron binding energy (7.1 eV) is distinctly different from that of 1b (8.5 eV). Molecular orbital analysis reveals a stronger interaction between filled pi(C=C) and pi(SiR2) group orbitals in 1c than in 1a and 1b. The energy shift in the highest occupied molecular orbital is also reflected in the first oxidation potentials as observed in the cyclic voltammograms of the respective compounds (1.47, 0.88, and 0.46 V for 1a, 1b and 1c, respectively). Furthermore, 1,4-disilacyclohexadiene 1c absorbs strongly at 273 nm (4.55 eV), whereas 1a and 1b have no symmetry allowed excitations above 215 nm (below 5.77 eV). Thus, suitably substituted 1,4-disilacyclohexa-2,5-dienes could represent novel building blocks for the design of larger cross-hyperconjugated molecules as alternatives to traditional purely cross-p-conjugated analogues, and could allow for design of molecules with properties that are not accessible to those that are exclusively pi-conjugated.

  • 23. Villemoes, Petrine
    et al.
    Arnesen, Arne
    Heijkenskjöld, Filip
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
    Wännström, Anders
    Isotope shifts and hyperfine structure of 134 – 138Ba by fast ion beam-laser spectroscopy1993In: J . Phys. B, Vol. 26, p. 4289-4299Article in journal (Refereed)
  • 24.
    Volkwyn, Trevor
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics. University of the Western Cape, Cape Town, South Africa.
    Airey, John
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics. Department of Mathematics and Science Education, Stockholm /University, Sweden.
    Gregorcic, Bor
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics.
    Heijkenskjöld, Filip
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics.
    Multimodal Transduction in Upper-secondary School Physics2018Conference paper (Other academic)
    Abstract [en]

    In this study we video-filmed upper-secondary physics students working with a laboratory task designed to encourage transduction (Bezemer & Kress 2008) when learning about coordinate systems.

     

    Students worked in pairs with an electronic measurement device to determine the direction of the Earth’s magnetic field. The device, IOLab, can be held in the hand and moved around. The results of this movement are graphically displayed on a computer screen as changes in the x, y and z components of the Earth’s magnetic field. The students were simply instructed to use the IOLab to find the direction of the Earth’s magnetic field and mark its direction using a red paper arrow.

     

    A full multimodal transcription of the student interaction was made (Baldry & Thibault 2006). In our analysis of this transcription, three separate transductions of meaning were identified—transduction of meaning potential in the room to the computer screen, transduction of this meaning to the red arrow, and finally transduction into student gestures. We suggest that this final transduction could not have been made without the introduction of the arrow, which functioned as a coordinating hub (Fredlund et al 2012).

     

    We recommend that teachers should carefully think about the resources in a task that may function as a coordinating hub and should also look for student transductions in their classrooms as confirmation that learning is taking place.

     

    References

    Ainsworth, S. (2006). DeFT: A conceptual framework for considering learning with multiple representations. Learning and Instruction, 16(3), 183-198.

    Airey, J. (2009). Science, language, and literacy: Case studies of learning in Swedish university physics (Doctoral dissertation, Acta Universitatis Upsaliensis). http://publications.uu.se/theses/abstract.xsql?dbid=9547 

    Airey, J. (2015). Social Semiotics in Higher Education: Examples from teaching and learning in undergraduate physics In: SACF Singapore-Sweden Excellence Seminars, (STINT) , 2015 (pp. 103). urn:nbn:se:uu:diva-266049.

    Airey, J., & Linder, C. (2009). A disciplinary discourse perspective on university science learning: Achieving fluency in a critical constellation of           modes. Journal of Research in Science Teaching, 46(1), 27-49.

    Airey, J. & Linder, C. (2015) Social Semiotics in Physics Education: Leveraging critical constellations of disciplinary representations ESERA          2015 From http://urn.kb.se/resolve?urn=urn%3Anbn%3Ase%3Auu%3Adiva-260209

    Airey, J., & Linder, C. (2017). Social Semiotics in University Physics Education. In D. F. Treagust, R. Duit, & H. E. Fischer (Eds.), Multiple Representations in Physics Education (pp. 95-122). Cham, Switzerland: Springer.

    Baldry, A., & Thibault, P. J. (2006). Multimodal Transcription and Text Analysis. London: Equinox Publishing.

    Bezemer, J., & Kress, G. (2008). Writing in multimodal texts: a social semiotic account of designs for learning. Written Communication, 25(2),           166-195.

    Fredlund, T., Airey, J., & Linder, C. (2012). Exploring the role of physics representations: an illustrative example from students sharing knowledge about refraction. European Journal of Physics, 33, 657-666.

    Kress, G. (2010). Multimodality: A social semiotic approach to contemporary communication. London: Routledge.

    Lemke, J. L. (1998). Teaching all the languages of science: Words, symbols, images, and actions. In Conference on Science Education in Barcelona.

    Selen, M. (2013). Pedagogy meets Technology: Optimizing Labs in Large Enrollment Introductory Courses. Bulletin of the American Physical      Society58. http://meetings.aps.org/Meeting/APR13/Session/C7.3

    Volkwyn, T., Airey, J., Gregorčič, B., & Heijkenskjöld, F. (2016). Multimodal transduction in secondary school physics 8th International Conference on Multimodality, 7th-9th December 2016. Cape Town, South Africa. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-316982.

    Volkwyn, T., Airey, J., Gregorčič, B., Heijkenskjöld, F., & Linder, C. (2018). Physics students learning about abstract mathematical tools when engaging with “invisible” phenomena. PERC proceedings 2018 https://www.compadre.org/per/perc/proceedings.cfm.

    Volkwyn, T., Airey, J., Gregorčič, B., & Heijkenskjöld, F. (submitted). Learning Science through Transduction: Multimodal disciplinary meaning-making in the physics laboratory. Designs for Learning.

    Wu, H-K, & Puntambekar, S. (2012). Pedagogical Affordances of Multiple External Representations in Scientific Processes. Journal of Science Education and Technology, 21(6), 754-767.

  • 25.
    Volkwyn, Trevor
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics. Department of Physics and Astronomy, University of the Western Cape, Cape Town, South Africa.
    Airey, John
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics. Department of Mathematics and Science Education, Stockholm University, Sweden.
    Gregorcic, Bor
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics.
    Heijkenskjöld, Filip
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics.
    Transduction and Science Learning: Multimodality in the Physics Laboratory2019In: Designs for Learning, ISSN 1654-7608, Vol. 11, no 1, p. 16-29, article id 118Article in journal (Refereed)
    Abstract [en]

    In this paper we discuss the role of transduction in the teaching and learning of science. We video-filmed pairs of upper-secondary physics students working with a laboratory task designed to encourage transduction (Bezemer & Kress, 2008). The students were simply instructed to use a hand-held electronic measurement device (IOLab) to find the direction of the Earth’s magnetic field and mark its direction using a paper arrow.

    A full multimodal transcription of the student interaction was made. In our analysis of this transcription we identify three separate transductions of meaning. In particular, we observed that student transduction of meaning to the paper arrow allowed it to function as both a persistent placeholder for all the meaning making that had occurred up until that point and as a coordinating hub for further meaning making.

    Our findings lead us to recommend that teachers interrogate the set of resources necessary for appropriate disciplinary knowledge construction in the tasks they present to students. Here, teachers should think carefully about whether the introduction of a persistent placeholder would be useful and in that case what this placeholder could be. We also suggest that teachers should think about what persistent resource may function as a coordinating hub for the students.

    Finally, we suggest that teachers should be on the lookout for student transductions to new semiotic resources in their classrooms as a sign that learning is taking place. We claim that the constraining and complementary nature of transduction offers a good opportunity for teachers to check student understanding, since disciplinary meanings need to be coherent across semiotic systems (modes).

  • 26.
    Volkwyn, Trevor
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics. Department of Physics and Astronomy, University of the Western Cape, South Africa.
    Airey, John
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics. Stockholm University, Stockholm, Sweden.
    Gregorcic, Bor
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics.
    Heijkenskjöld, Filip
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics.
    Working with magnetic field to learn about coordinate systems: A social semiotic approach2017Conference paper (Other academic)
    Abstract [en]

    In the teaching and learning of physics, a wide range of semiotic resources are used, such as spoken and written language, graphs, diagrams, mathematics, hands on work with apparatus, etc. (Lemke, 1998). In this respect it has been argued that there is a critical constellation of semiotic resources that is needed for appropriate construction of any given disciplinary concept (Airey & Linder, 2009; Airey, 2009). In this social semiotic tradition, it is the development of “fluency” in the individual semiotic resource systems and the ease of transduction (movement and coordination of meaning) between the various semiotic resource systems that makes disciplinary learning possible. We report here findings from an interpretive study of physics students working with a laboratory task designed to encourage transduction when learning about coordinate systems. A hand-held electronic measurement device (IOLab) was used to display components of the Earth’s magnetic field in real time. Our intention was for students to experience the movability of coordinate systems by open-ended investigation of dynamic, real-time changes in the x, y and z components displayed on the computer screen as they manipulated the device. Building on earlier work of Fredlund et. al. (2012) our analysis identifies three types of transduction, the last of which is transduction of meaning to a new modality (iconic gesture) not previously used by the students. We suggest this final form of transduction is indicative of what students have learned and offers the teacher a chance to confirm/challenge student conceptions. Our data clearly demonstrates how careful, open-ended task design, coupled with timely instructor questions can leverage the pedagogical affordances (Airey, 2015) of a range of semiotic resources to make physics learning possible. We therefore claim that understanding the roles that different semiotic resources play for physics learning is vital and call for further research in this area.

  • 27.
    Volkwyn, Trevor
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics. Department of Physics and Astronomy, University of the Western Cape.
    Airey, John
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics. Stockholm University.
    Gregorcic, Bor
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics.
    Heijkenskjöld, Filip
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics.
    Linder, Cedric
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics.
    Physics students learning about abstract mathematical tools when engaging with “invisible” phenomena2017In: 2017 Physics Education Research Conference Proceedings / [ed] L. Ding, A. Traxler, and Y. Cao, Cincinnati, Ohio: American Association of Physics Teachers , 2017, p. 408-411Conference paper (Other academic)
    Abstract [en]

    The construction of physics knowledge of necessity entails a range of semiotic resources, (e.g. specialized language, graphs, algebra, diagrams, equipment, gesture, etc.). In this study we documented physics students' use of different resources when working with an "invisible" phenomenon--magnetic field. Using a social semiotic framework, we show how appropriate coordination of resources not only enabled students to learn something about the Earth's magnetic field, but also about the use of an abstract mathematical tool--coordinate systems. Our work leads us to make three suggestions: 1. The potential for learning physics can be maximized by designing tasks that encourage students to use a specific set of resources.  2. Thought should be put into what this particular set of resources should be and how they may be coordinated. 3. Close attention to the different resources that students use can allow physics teachers to gauge the learning occurring in their classrooms.

  • 28.
    Volkwyn, Trevor
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics. Department of Physics and Astronomy, University of the Western Cape.
    Airey, John
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics. Stockholm University.
    Gregorcic, Bor
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics.
    Heijkenskjöld, Filip
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics.
    Linder, Cedric
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics. Department of Physics and Astronomy, University of the Western Cape.
    Physics students learning about abstract mathematical tools while engaging with “invisible” phenomena2017Conference paper (Other academic)
    Abstract [en]

    The construction of physics knowledge of necessity entails a range of semiotic resources, (e.g. specialized language, graphs, algebra, diagrams, equipment, gesture, etc.). In this study we documented physics students' use of different resources when working with an "invisible" phenomenon--magnetic field. Using a social semiotic framework, we show how appropriate coordination of resources not only enabled students to learn something about the Earth's magnetic field, but also about the use of an abstract mathematical tool--coordinate systems. Our work leads us to make three suggestions: 1. The potential for learning physics can be maximized by designing tasks that encourage students to use a specific set of resources. 2. Thought should be put into what this particular set of resources should be and how they may be coordinated.3. Close attention to the different resources that students use can allow physics teachers to gauge the learning occurring in their classrooms.

  • 29.
    Volkwyn, Trevor
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics. Department of Physics and Astronomy, University of the Western Cape.
    Airey, John
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics. Stockholm University.
    Gregorcic, Bor
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics.
    Heijkenskjöld, Filip
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Linder, Cedric
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics. Department of Physics and Astronomy, University of the Western Cape.
    Teaching the movability of coordinate systems: Discovering disciplinary affordances2017Conference paper (Other academic)
    Abstract [en]

    When students are introduced to coordinate systems in their physics textbooks these are usually oriented in the same manner (x increases to the right). There is a real danger then, that students see coordinate systems as fixed. However, as we know, movability is one of the main disciplinary affordances of coordinate systems. Students worked with an open-ended task to find the direction of Earth’s magnetic field. This was achieved by manipulating a measurement device (IOLab) so as to maximize the signal for one component of the field, whilst at the same time keeping the other two components at zero. In the process of completing this task, students came to experience themselves as holding a movable coordinate system. From this point they spontaneously offer elaborations about the usefulness of purposefully setting up coordinate systems for problem solving. In our terms, they have discovered one of the disciplinary affordances of coordinate systems.

  • 30.
    Volkwyn, Trevor
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics. Department of Physics and Astronomy, University of the Western Cape.
    Airey, John
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics. Stockholm University.
    Gregorcic, Bor
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics.
    Heijkenskjöld, Filip
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Linder, Cedric
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Physics Didactics. Department of Physics and Astronomy, University of the Western Cape.
    The IOLab and magnetic Field – Magnetic north versus actual direction2017Conference paper (Other academic)
    Abstract [en]

    Most students will be familiar with the compass as a tool that points north. However, the compass only shows us one component—the terrestrial projection—of the Earth’s magnetic field. In contrast, the IOLab potentially gives students access to the actual direction of the field. We have designed an open-ended task in which pairs of students use the IOLab to determine the actual direction of the Earth’s magnetic field in a laboratory classroom. Without any prior instruction or step-by-step procedure to follow, students simultaneously coordinate a set of resources: speech (in groups; and with facilitator), interpretation of graphical readouts, physical manipulation of the IOLab and proprioception. By coordinating the resources available, the students in our study can be seen to quickly come to a moment of disciplinary insight, where they realize the true direction of the magnetic field.

  • 31. Wang, M
    et al.
    Arnesen, Arne
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Dunne, P
    Hallin, R
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    OReilly, F
    Wavelengths and energy levels of Fe VIII1997In: PHYSICA SCRIPTA, ISSN 0281-1847, Vol. T73, p. 77-78Article in journal (Refereed)
    Abstract [en]

    The Fe VIII (Fe7+) spectrum has been investigated in the 35-200 M1 wavelength region. The radiation emission following slow ion-atom collisions has been observed for the collision system Fe8+ + T (T He or Ar) at the Fe8+ energy 80keV. Twelve new transitio

  • 32. Wang, M
    et al.
    Arnesen, Arne
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Hallin, R
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Langereis, A
    Larsson, MO
    Nordling, C
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Wannstrom, A
    Collision-based spectroscopy of Xe VIII Rydberg states1996In: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, ISSN 0740-3224, Vol. 13, no 8, p. 1650-1658Article in journal (Refereed)
    Abstract [en]

    The photon emission from 10q keV Xe-q+ + T (q = 7, 8; T = He, Ar, Na) collisions has been recorded in the 35-800-nm wavelength region. Especially in the T = Na spectra we observed many unreported lines, of which 68 were ascribed to Xe VIII transitions inv

  • 33. Wang, M
    et al.
    Arnesen, Arne
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Hallin, R
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Langereis, A
    Larsson, MO
    Nordling, C
    Wannstrom, A
    Collision-based spectroscopy of Xe VIII Rydberg (vol 13, pg 1650, 1996)1997In: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICSArticle in journal (Refereed)
  • 34. Wang, M
    et al.
    Arnesen, Arne
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Hallin, R
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Larsson, MO
    Wannstrom, A
    Trigueiros, AG
    Loginov, AV
    Studies of the collision-based Xe VI and Xe VII spectra1997In: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, ISSN 0740-3224, Vol. 14, no 12, p. 3277-3281Article in journal (Refereed)
    Abstract [en]

    Collision-based spectroscopy of a Xeq+ (q = 6, 7) beam with a target T (T = Na, Ar) has been performed in the 35-800-nm wavelength region. Twenty-five new Xe VI lines and twenty-two new Xe VII lines were classified, twelve new energy levels of Xe VI and n

  • 35. Wang, M
    et al.
    Arnesen, Arne
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Hallin, R
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Wavelengths and energy levels of Co IX1997In: PHYSICA SCRIPTA, ISSN 0281-1847, Vol. 56, no 6, p. 609-610Article in journal (Refereed)
    Abstract [en]

    The K-Like Co IX spectrum has been investigated in the 35-200 nm wavelength region using collision-based spectroscopy. Transitions involving the 4p, 5p, 4d, 5d and 4f electron configurations have been observed. All the energy levels of the 5p, 4d and 56 c

  • 36. Wang, M
    et al.
    Faulkner, R
    O'Reilly, F
    Manrique, J
    Arnesen, Arne
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Duffy, G
    Dunne, P
    Hallin, R
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    O'Sullivan, G
    Wavelengths and energy levels of potassium-like Ni x1999In: JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, ISSN 0953-4075, Vol. 32, no 22, p. 5299-5309Article in journal (Refereed)
    Abstract [en]

    An analysis of potassium-like Ni x in the 15-170 nm wavelength region is reported following observations involving collision-based spectroscopy and laser plasma spectroscopy. Ferry five transitions from different excited states in Ni x are identified. Twe

  • 37. Wang, M
    et al.
    Larsson, MO
    Arnesen, Arne
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Hallin, R
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Nordling, C
    Wannstrom, A
    Collision-based spectroscopy of Xe VI Rydberg states1996In: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, ISSN 0740-3224, Vol. 13, no 12, p. 2715-2719Article in journal (Refereed)
    Abstract [en]

    The photon emission from 60-keV Xe6+ colliding with Na or Ar was recorded in the 35-800-nm wavelength region. Several of the observed lines were classified as transitions from singly excited states in Xe5+. The dipole polarizability of Xe6+ and the ioniza

  • 38. Wang, M
    et al.
    Larsson, MO
    Arnesen, Arne
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Hallin, R
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Nordling, C
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Wannstrom, A
    Collision-based spectroscopy of Xe VI Rydberg states (vol 13, pg 2715, 1996)1996In: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICSArticle in journal (Refereed)
  • 39. Wang, M
    et al.
    OReilly, F
    Dunne, P
    Arnesen, Arne
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Heijkenskjöld, Filip
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    Hallin, R
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
    OSullivan, G
    Wavelengths and energy levels of potassium-like Mn VII1997In: JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, ISSN 0953-4075, Vol. 30, no 19, p. 4175-4181Article in journal (Refereed)
    Abstract [en]

    Photon spectroscopy of potassium-like Mn VII in the 15-200 nm wavelength region is reported following observations involving collision-based spectroscopy and laser plasma spectroscopy. Nineteen transitions from different excited states in Mn VII are ident

  • 40. Wang, Mingqi
    et al.
    Larsson, Mårten
    Arnesen, Arne
    Hallin, Reinhold
    Heijkenskjöld, Filip
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science.
    Nordling, Carl
    Wännström, Anders
    Collision-based spectroscopy of Xe VI Rydberg states1996In: J. Opt. Soc. Am., Vol. 13, p. 2715-2719Article in journal (Refereed)
  • 41. Zou, Y
    et al.
    Wang, M
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Hutton, R
    Heijkenskjöld, Filip
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Collision based spectroscopy of Na- and Mg-like argon1997In: Physica scripta. T, ISSN 0281-1847, Vol. T73, p. 79-80Article in journal (Refereed)
    Abstract [en]

    In this work, Ne-like Ar8+ ions in metastable 2p53s 3P0,2 levels from an ECR source were passed through a He gas target to populate core excited levels of Na-like Ar7+. The resulting spectra were measured and compared with those from Ar9+ passing the same He target. The population mechanism for core excited 2p53p2 based on one electron capture by the metastable Ar8+ levels is discussed. Our results indicate that the two electron-one photon transitions from 2p53s4p is the main populating process. Also, by increasing the length of the gas target, enhancement of the intensity ratio between lines from long lived and short lived levels was observed.

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