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An x-ray absorption and a normal Auger study of the fine structure in the S2p(-1) region of the CS2 molecule
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.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Soft X-Ray Physics.
2009 (English)In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, E-ISSN 1361-6455, Vol. 42, no 8, p. 085102-Article in journal (Refereed) Published
Abstract [en]

The photoabsorption spectrum of the CS2 molecule has been recorded in the vicinity of the two S2p(3/2,1/2) ionization limits at 169.806 eV and 171.075 eV. Synchrotron radiation was used with photon energies covering the energy range between 160 eV and 175 eV. Extensive structure is observed below the ionization limits. It is associated with transitions to both valence and Rydberg states. The latter contain vibrational fine structure due to excitations of the nu(3) asymmetric stretching mode. The vibrational energy is approximately 195 meV in close agreement with previous results obtained from photoelectron spectra for the S2p(3/2,1/2) single-hole states. Above the ionization limits, a resonance is observed in the ionization continuum. An electron spectrum recorded on top of this resonance reveals S2p(-1) VV Auger transitions at high resolution.

Place, publisher, year, edition, pages
2009. Vol. 42, no 8, p. 085102-
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-129137DOI: 10.1088/0953-4075/42/8/085102ISI: 000265031200010OAI: oai:DiVA.org:uu-129137DiVA, id: diva2:337742
Available from: 2010-08-09 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Studies of Single and Multiple Ionization Processes in Rare Gases and some Small Molecules
Open this publication in new window or tab >>Studies of Single and Multiple Ionization Processes in Rare Gases and some Small Molecules
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis various aspects of photoionization are investigated with respect to both single and multiple electron emission from atoms and molecules. The studies include both valence and core levels and involve transitions which leave the atoms or molecules in various charge states.

S2p electrons in the CS2 molecule were excited into Rydberg orbitals close to the ionization threshold. Subsequent autoionization leads to the emission of single electrons which were detected by a conventional electron spectrometer, bringing the molecule into various cationic states characterized by two valence holes and a Rydberg spectator electron. Vibrational progressions have been assigned as excitations of the totally symmetric v1 and the asymmetric stretching v3 modes in the cationic states.

Double ionization spectra of the CS2 molecule were recorded in the S2p and C1s innershell ionization regions using a magnetic bottle many-electron coincidence spectrometer, revealing dicationic states formed out of one inner-shell vacancy and one vacancy in the valence region. The spectrum connected to the S2p vacancy is richly structured in contrast to the spectrum connected to the C1s vacancy, which shows essentially one distinct band.

The development of a new variant of the magnetic bottle coincidence technique tailored for valence triple photoionization studies of rare gas atoms at synchrotron radiation sources is presented, overcoming the problem of high repetition rate in single-bunch operation of the storage ring. The studies of the rare gas atoms confirm that a correction of the lowest triple-ionization energy of Kr, currently listed in standard tables, is needed.

Also, single-site N1s and O1s double core ionization of the NO and N2O molecules and single-site O1s, C1s and S2p double core ionization of the OCS molecule has been studied with the magnetic bottle technique. Double core holes are of particular interest due to putatively larger chemical shifts compared to single core holes. The observed ratio between the double and single ionization energies are in all cases close or equal to 2.20.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2014. p. 55
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1132
National Category
Atom and Molecular Physics and Optics
Research subject
Physics with spec. in Atomic, Molecular and Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-221128 (URN)978-91-554-8910-6 (ISBN)
Public defence
2014-05-16, sal 80121, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15 (Swedish)
Opponent
Supervisors
Available from: 2014-04-24 Created: 2014-03-25 Last updated: 2014-04-29Bibliographically approved

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