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Applications of Soft X-Ray Spectroscopy
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Mjukröntgenfysik.
2011 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Soft X-ray emission spectroscopy is an old experimental technique that has seen a strong revival since the advent of new high brilliance soft X-ray sources in the shape of synchrotrons.  This thesis covers a range of applications where soft x-ray techniques have been applied. I have looked at fluorescence yield from doubly excited helium in field free conditions as well as in the presence of weak electric and magnetic fields. Using soft X-ray emission spectroscopy (SXES) I have explored scattering mechanisms in molecular systems. Quenching of symmetry breaking transitions by detuning of the excitation energy was observed in CO2. Bond-length dependence was seen for symmetry breaking transitions in a series of hydrocarbons. Dissociation dynamics was explored in OCS and HCl. I have also applied SXES to liquid water exploring the properties of hydrogen bonding.  Buried layers of AlAs under 100 Å GaAs(100) was studied and thickness dependence and interface effects observed. The technique was also used to study the electronic structure of yttrium and vanadium hydrides. dd-excitations and accompanying spin flip excitations was observed in Cu M resonant x-ray Raman emission from Sr2CuO2Cl2.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis , 2011. , s. 61
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 860
Nationell ämneskategori
Atom- och molekylfysik och optik Den kondenserade materiens fysik
Forskningsämne
Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik
Identifikatorer
URN: urn:nbn:se:uu:diva-159369ISBN: 978-91-554-8173-5 (tryckt)OAI: oai:DiVA.org:uu-159369DiVA, id: diva2:444570
Disputation
2011-11-11, Å4001, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2011-10-21 Skapad: 2011-09-29 Senast uppdaterad: 2011-11-04Bibliografiskt granskad
Delarbeten
1. Influence of the Radiative Decay on the Cross Section for Double Excitations in Helium
Öppna denna publikation i ny flik eller fönster >>Influence of the Radiative Decay on the Cross Section for Double Excitations in Helium
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1999 (Engelska)Ingår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 83, nr 5, s. 947-950Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The fluorescence yield spectrum of the double excitations in helium has been measured. All three Rydberg series converging to the N = 2 threshold are resolved, and the intensity of the individual lines is determined. The intensity variation through each series indicates that the radiative decay channel cannot be neglected when discussing the double excitations in helium. This calls for a revision of the interpretation of the absorption spectrum, and sets the limit for using the ion yield method to monitor the absorption probability.

Nyckelord
excited-states, high-resolution, threshold, lifetime, He+
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:uu:diva-66856 (URN)10.1103/PhysRevLett.83.947 (DOI)
Tillgänglig från: 2008-10-17 Skapad: 2008-10-17 Senast uppdaterad: 2017-11-28Bibliografiskt granskad
2. Radiative and Relativistic Effects in the Decay of Highly Excited States in Helium
Öppna denna publikation i ny flik eller fönster >>Radiative and Relativistic Effects in the Decay of Highly Excited States in Helium
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2000 (Engelska)Ingår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 85, nr 6, s. 1202-1205Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A recent experimental study [J.-E. Rubensson et al., Phys. Rev. Lett. 83, 947 (1999)] measured a significant fluorescence yield of the He( 2lnl) photoexcited resonances, showing major qualitative differences from nonrelativistic predictions. We present a further theoretical study of these states, and perform R-matrix multichannel quantum defect theory calculations to extract fluorescence and ionization cross sections. These theoretical results are in excellent agreement with newer, higher-resolution measurements. Radiative and spin-orbit effects are quantified and shown to play an important role in the overall characterization of highly excited states.

Nationell ämneskategori
Fysik
Identifikatorer
urn:nbn:se:uu:diva-94516 (URN)10.1103/PhysRevLett.85.1202 (DOI)
Tillgänglig från: 2006-05-05 Skapad: 2006-05-05 Senast uppdaterad: 2017-12-14Bibliografiskt granskad
3. Double Excitations of Helium in Weak Static Electric Fields
Öppna denna publikation i ny flik eller fönster >>Double Excitations of Helium in Weak Static Electric Fields
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2006 Ingår i: Physical Review Letters, ISSN 0031-9007, Vol. 96, s. 043002-Artikel i tidskrift (Refereegranskat) Published
Identifikatorer
urn:nbn:se:uu:diva-95805 (URN)
Tillgänglig från: 2007-04-24 Skapad: 2007-04-24 Senast uppdaterad: 2016-04-26Bibliografiskt granskad
4. Magnetic-field induced enhancement in the fluorescence yield spectrum of doubly excited states in helium
Öppna denna publikation i ny flik eller fönster >>Magnetic-field induced enhancement in the fluorescence yield spectrum of doubly excited states in helium
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2006 (Engelska)Ingår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 97, nr 25, s. 253002-Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

An influence of static magnetic fields on the fluorescence yield spectrum of He in the vicinity of the N=2 thresholds has been observed. The experimental results are in excellent agreement with predictions based on multichannel quantum defect theory, and it is demonstrated that the Rydberg electron ℓ mixing due to the diamagnetic interaction is essential for the description of the observed fluorescence yield intensity enhancement.

Nationell ämneskategori
Fysik
Identifikatorer
urn:nbn:se:uu:diva-95806 (URN)10.1103/PhysRevLett.97.253002 (DOI)000243414600018 ()
Tillgänglig från: 2007-04-24 Skapad: 2007-04-24 Senast uppdaterad: 2017-12-14
5. Quenching of symmetry breaking in resonant inelastic X-ray scattering by detuned excitation
Öppna denna publikation i ny flik eller fönster >>Quenching of symmetry breaking in resonant inelastic X-ray scattering by detuned excitation
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1996 (Engelska)Ingår i: PHYSICAL REVIEW LETTERS, ISSN 0031-9007, Vol. 77, nr 25, s. 5035-5038Artikel i tidskrift (Övrigt vetenskapligt) Published
Abstract [en]

Observations made in oxygen K emission of CO2 show that the symmetry selective character of resonant x-ray emission is excitation energy dependent. Electronically dipole forbidden O K emission lines are observed for excitation at the O 1s --> pi* resonanc

Ort, förlag, år, upplaga, sidor
AMER INST PHYSICS, 1996
Nyckelord
BAND-STRUCTURE; EMISSION; FLUORESCENCE; LOCALIZATION; CK
Identifikatorer
urn:nbn:se:uu:diva-74059 (URN)
Anmärkning
Addresses: Skytt P, UNIV UPPSALA, DEPT PHYS, BOX 530, S-75121 UPPSALA, SWEDEN. UNIV NEVADA, DEPT CHEM, LAS VEGAS, NV 89154. LINKOPING UNIV, INST PHYS & MEASUREMENT TECHNOL, S-58183 LINKOPING, SWEDEN.Tillgänglig från: 2008-10-17 Skapad: 2008-10-17 Senast uppdaterad: 2011-11-04
6. Bond-length-dependent core hole localization observed in simple hydrocarbons
Öppna denna publikation i ny flik eller fönster >>Bond-length-dependent core hole localization observed in simple hydrocarbons
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1999 (Engelska)Ingår i: PHYSICAL REVIEW LETTERS, ISSN 0031-9007, Vol. 83, nr 7, s. 1315-1318Artikel i tidskrift (Övrigt vetenskapligt) Published
Abstract [en]

Soft x-ray-emission spectroscopy is applied to measure the amount of dynamic symmetry breaking in core-excited acetylene, ethylene, and ethane. Large variations are observed between the molecules and are rationalized in terms of the different C-C bond len

Ort, förlag, år, upplaga, sidor
AMERICAN PHYSICAL SOC, 1999
Nyckelord
X-RAY-EMISSION; K-SHELL EXCITATION; PHOTOELECTRON-SPECTRA; SYMMETRY-BREAKING; HIGH-RESOLUTION; VIBRATIONAL STRUCTURE; SPECTROSCOPY; SCATTERING; IONIZATION; ETHENE
Identifikatorer
urn:nbn:se:uu:diva-66755 (URN)
Anmärkning
Addresses: Gunnelin K, Univ Uppsala, Dept Phys, Box 530, S-75121 Uppsala, Sweden. Univ Uppsala, Dept Phys, S-75121 Uppsala, Sweden. Mid Sweden Univ, Dept Phys & Math, S-85170 Sundsvall, Sweden. Linkoping Univ, Inst Phys & Measurement Technol, S-58183 LinkTillgänglig från: 2008-10-17 Skapad: 2008-10-17 Senast uppdaterad: 2011-11-04
7. Competition between decay and dissociation of core-excited carbonyl sulfide studied by x-ray scattering
Öppna denna publikation i ny flik eller fönster >>Competition between decay and dissociation of core-excited carbonyl sulfide studied by x-ray scattering
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1999 (Engelska)Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 59, nr 6, s. 4281-4287Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We show evidence of dissociation during resonant inelastic soft x-ray scattering. Carbon and oxygen K-shell and sulfur L-shell resonant and nonresonant x-ray emission spectra were measured using monochromatic synchrotron radiation for excitation and ionization. After sulfur L2,3→π*, σ* excitation, atomic lines are observed in the emission spectra as a consequence of competition between de-excitation and dissociation. In contrast the carbon and oxygen spectra show weaker line-shape variations and no atomic lines. The spectra are compared to results from ab initio calculations. The discussion of the dissociation paths is based on calculated potential energy surfaces and atomic transition energies.

Nyckelord
HIGH-RESOLUTION; OCS MOLECULE; ABSORPTION SPECTRA; STATIC EXCHANGE; AUGER-SPECTRA; AB-INITIO; EMISSION; CS2; DYNAMICS; HCL
Nationell ämneskategori
Fysik
Identifikatorer
urn:nbn:se:uu:diva-67148 (URN)10.1103/PhysRevA.59.4281 (DOI)
Tillgänglig från: 2006-11-08 Skapad: 2006-11-08 Senast uppdaterad: 2019-07-01Bibliografiskt granskad
8. Resonant L-II,L-III x-ray Raman scattering from HCl
Öppna denna publikation i ny flik eller fönster >>Resonant L-II,L-III x-ray Raman scattering from HCl
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2006 (Engelska)Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 74, nr 6, s. 062512-Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We have studied the spectral features of Cl L-II,L-III resonant x-ray Raman scattering of HCl molecules in gas phase both experimentally and theoretically. The theory, formulated in the intermediate-coupling scheme, takes into account the spin-orbital and molecular-field splittings in the Cl 2p shells, as well as the Coulomb interaction of the core hole with unoccupied molecular orbitals. Experiment and theory display nondispersive dissociative peaks formed by decay transitions in both molecular and dissociative regions. The molecular and atomic peaks collapse in a single narrow resonance because the dissociative potentials of core-excited and final states are parallel to each other along the whole pathway of the nuclear wave packet.

Nationell ämneskategori
Fysik
Identifikatorer
urn:nbn:se:uu:diva-146649 (URN)10.1103/PhysRevA.74.062512 (DOI)000243166700063 ()
Tillgänglig från: 2011-02-21 Skapad: 2011-02-18 Senast uppdaterad: 2017-12-11Bibliografiskt granskad
9. X-Ray Emission Spectroscopy of Hydrogen Bonding and Electronic Structure of Liquid Water
Öppna denna publikation i ny flik eller fönster >>X-Ray Emission Spectroscopy of Hydrogen Bonding and Electronic Structure of Liquid Water
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2002 Ingår i: Physical Review Letters, ISSN 0031-9007, Vol. 89, nr 13, s. 137402-Artikel i tidskrift (Refereegranskat) Published
Identifikatorer
urn:nbn:se:uu:diva-92079 (URN)
Tillgänglig från: 2004-09-17 Skapad: 2004-09-17 Senast uppdaterad: 2011-11-04Bibliografiskt granskad
10. Local structures of liquid water studied by x-ray emission spectroscopy
Öppna denna publikation i ny flik eller fönster >>Local structures of liquid water studied by x-ray emission spectroscopy
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2004 Ingår i: Physical Review B (Condensed Matter and Materials Physics -1(II)), ISSN 1098-0121, Vol. 69, s. 024201-Artikel i tidskrift (Refereegranskat) Published
Identifikatorer
urn:nbn:se:uu:diva-92080 (URN)
Tillgänglig från: 2004-09-17 Skapad: 2004-09-17 Senast uppdaterad: 2011-11-04Bibliografiskt granskad
11. Direct observation of interface effects of thin AlAs(100) layers buried in GaAs
Öppna denna publikation i ny flik eller fönster >>Direct observation of interface effects of thin AlAs(100) layers buried in GaAs
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2000 (Engelska)Ingår i: APPLIED SURFACE SCIENCE, ISSN 0169-4332, Vol. 166, nr 1-4, s. 309-312Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A study of the electronic structure of ultrathin AlAs layers buried in GaAs(100) and their interfaces is presented. Al L-2,L-3 soft-X-ray-emission (SXE) spectra from the AlAs layers were measured. The spectra show distinct thickness-dependent features, wh

Ort, förlag, år, upplaga, sidor
ELSEVIER SCIENCE BV, 2000
Nyckelord
interface; AlAs; soft X-ray emission; synchrotron radiation; X-RAY EMISSION
Identifikatorer
urn:nbn:se:uu:diva-36883 (URN)
Anmärkning
Addresses: Agui A, JAERI, SPring 8, Sayo, Hyogo 6795143, Japan. JAERI, SPring 8, Sayo, Hyogo 6795143, Japan. Univ Uppsala, Dept Phys, SE-75121 Uppsala, Sweden. Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden. Hogskolan I Skovde, Dept Nat SciTillgänglig från: 2008-10-17 Skapad: 2008-10-17 Senast uppdaterad: 2011-11-04
12. Theoretical investigation of the thickness dependence of soft-x-ray emission from thin AlAs(100) layers buried in GaAs
Öppna denna publikation i ny flik eller fönster >>Theoretical investigation of the thickness dependence of soft-x-ray emission from thin AlAs(100) layers buried in GaAs
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2000 (Engelska)Ingår i: PHYSICAL REVIEW B, ISSN 1098-0121, Vol. 61, nr 8, s. 5540-5545Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Ultrathin AlAs(100) layers of 1-, 2-, and 5-ML thickness buried in GaAs are investigated by nb initio calculations. Unique experimental soft-x-ray emission spectra are explained in terms of interface effects and changes with layer thickness are found in t

Ort, förlag, år, upplaga, sidor
AMERICAN PHYSICAL SOC, 2000
Nyckelord
NORM-CONSERVING PSEUDOPOTENTIALS; BAND OFFSETS; GAAS/ALAS SUPERLATTICES; ELECTRONIC-STRUCTURE; GROUND-STATE; MODEL; HETEROJUNCTIONS; SURFACES; DENSITY
Identifikatorer
urn:nbn:se:uu:diva-37035 (URN)
Anmärkning
Addresses: Mankefors S, Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden. Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden. Hogskolan Skovde, Dept Nat Sci, S-54128 Skovde, Sweden. Univ Uppsala, Dept Phys, S-75121 Uppsala, Sweden.Tillgänglig från: 2008-10-17 Skapad: 2008-10-17 Senast uppdaterad: 2011-11-04
13. Hydrogen-induced changes of the electronic states in ultrathin single-crystal vanadium layers
Öppna denna publikation i ny flik eller fönster >>Hydrogen-induced changes of the electronic states in ultrathin single-crystal vanadium layers
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1997 (Engelska)Ingår i: PHYSICAL REVIEW B-CONDENSED MATTER, ISSN 0163-1829, Vol. 55, nr 19, s. 12914-12917Artikel i tidskrift (Övrigt vetenskapligt) Published
Abstract [en]

The electronic structure of vanadium in an Fe/V (001) superlattice, exposed to a 100 torr hydrogen pressure, was investigated using soft-x-ray emission spectroscopy and first-principles band-structure calculations. We present x-ray emission spectra from t

Ort, förlag, år, upplaga, sidor
AMER INST PHYSICS, 1997
Nyckelord
BAND
Identifikatorer
urn:nbn:se:uu:diva-73213 (URN)
Anmärkning
Addresses: UNIV UPPSALA, DEPT PHYS, S-75121 UPPSALA, SWEDEN.Tillgänglig från: 2008-10-17 Skapad: 2008-10-17 Senast uppdaterad: 2011-11-04
14. Probing the local electronic structure in the H induced metal-insulator transition of Y
Öppna denna publikation i ny flik eller fönster >>Probing the local electronic structure in the H induced metal-insulator transition of Y
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1999 (Engelska)Ingår i: JOURNAL OF PHYSICS-CONDENSED MATTER, Vol. 11, s. L119-Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The occupied acid unoccupied valence band states of yttrium (Y) metal, Y dihydride and Y trihydride were measured by soft x-ray emission and absorption spectroscopy. The experiments were complemented by first principles calculations. Both experiments and

Nyckelord
SWITCHABLE OPTICAL-PROPERTIES; THEORETICAL PREDICTION; YH3; SPECTROSCOPY; YTTRIUM; EXCITATIONS
Identifikatorer
urn:nbn:se:uu:diva-67425 (URN)
Anmärkning
Addresses: Hjorvarsson B, Royal Inst Technol, Dept Phys Mat, S-10044 Stockholm, Sweden. Royal Inst Technol, Dept Phys Mat, S-10044 Stockholm, Sweden. Univ Uppsala, Dept Phys, S-75121 Uppsala, Sweden. Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England.Tillgänglig från: 2006-11-08 Skapad: 2006-11-08 Senast uppdaterad: 2011-11-04
15. Resonant X-ray Raman spectra of Cu dd excitations in Sr2CUO2Cl2
Öppna denna publikation i ny flik eller fönster >>Resonant X-ray Raman spectra of Cu dd excitations in Sr2CUO2Cl2
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1998 (Engelska)Ingår i: PHYSICAL REVIEW LETTERS, ISSN 0031-9007, Vol. 80, nr 23, s. 5204-5207Artikel i tidskrift (Övrigt vetenskapligt) Published
Abstract [en]

We present resonant x-ray Raman scattering results on Sr2CuO2Cl2, a model compound for high-T-c superconductors. We demonstrate that the dd excitations can be observed and show that the polarization dependence can be used to identify the dd excitations. W

Ort, förlag, år, upplaga, sidor
AMERICAN PHYSICAL SOC, 1998
Nyckelord
LAMELLAR COPPER OXIDES; FLUORESCENCE SPECTROSCOPY; OPTICAL-ABSORPTION; EMISSION SPECTRA; LA2CUO4
Identifikatorer
urn:nbn:se:uu:diva-71151 (URN)
Anmärkning
Addresses: Kuiper P, Halmstad Univ Coll, ITN, Box 823, S-30118 Halmstad, Sweden. Univ Uppsala, Dept Phys, S-75121 Uppsala, Sweden. Univ Groningen, Ctr Mat Sci, Solid State Phys Lab, NL-9747 AG Groningen, Netherlands.Tillgänglig från: 2008-10-17 Skapad: 2008-10-17 Senast uppdaterad: 2011-11-04

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