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Double photoionisation of thiophene and bromine substituted thiophenes
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Soft X-Ray Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Soft X-Ray Physics.
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2008 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 129, no 23, 234303- p.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.

Place, publisher, year, edition, pages
2008. Vol. 129, no 23, 234303- p.
Keyword [en]
Green's function methods, molecule-photon collisions, organic compounds, photoelectron spectra, photoionisation, time of flight spectra
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-97572DOI: 10.1063/1.3039082ISI: 000261896700010OAI: oai:DiVA.org:uu-97572DiVA: diva2:172569
Available from: 2008-09-18 Created: 2008-09-18 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Experimental Techniques for Studies in Atomic & Molecular Physics
Open this publication in new window or tab >>Experimental Techniques for Studies in Atomic & Molecular Physics
2008 (English)Doctoral 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.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2008. 41 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 555
Keyword
spectroscopy, fast ion beam laser spectroscopy, time of flight photoelectron photoelectron coincidence, hyperfine structure, Rabi oscillation
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-9295 (URN)978-91-554-7289-4 (ISBN)
Public defence
2008-10-17, Siegbahnsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15
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Available from: 2008-09-18 Created: 2008-09-18 Last updated: 2015-10-26Bibliographically approved

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