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Formation of Kr3+ via core-valence doubly ionized intermediate states
Stockholm University, Faculty of Science, Department of Physics.
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2012 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 85, no 3, 032502- p.Article in journal (Refereed) Published
Abstract [en]

The time-of-flight photoelectron-photoion coincidence technique has been used to study single-photon 3d(9)4p(5) core-valence double ionization of Kr and subsequent Auger decay to triply charged states associated with the 4s(2)4p(3) and 4s(1)4p(4) configurations. The photon energy used was h nu = 150 eV. Multiconfiguration Dirac-Fock calculations were performed both for the doubly ionized intermediate states and the triply ionized final states. The intermediate states of Kr2+ are observed between 120 and 125 eV, whereas the final states of Kr3+ are observed between 74- and 120-eV ionization energy. Assignments of all structures are made based on the present numerical results. The calculated Auger rates give a detailed explanation of the relative line strengths observed.

Place, publisher, year, edition, pages
2012. Vol. 85, no 3, 032502- p.
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-76284DOI: 10.1103/PhysRevA.85.032502ISI: 000301104400014OAI: oai:DiVA.org:su-76284DiVA: diva2:526832
Note

8

Available from: 2012-05-15 Created: 2012-05-10 Last updated: 2017-12-07Bibliographically approved
In thesis
1. Single-photon multiple ionization processes studied by electron coincidence spectroscopy
Open this publication in new window or tab >>Single-photon multiple ionization processes studied by electron coincidence spectroscopy
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis is based on studies of multiple ionization of atoms and molecules induced by the absorption of a single photon. For the experimental investigations a time-of-flight magnetic bottle spectrometer has been used to detect the emitted electrons in coincidence. The method of coincidence time-of-flight spectroscopy and the experimental setup used is described. Experimental and theoretical results on molecular double core holes (DCHs) and multiple ionization of atoms are presented.

Molecular DCHs are of considerable interest, as their chemical shifts are predicted to be more sensitive than their single core hole counterparts. Using CH4 and NH3 as examples, it is shown that molecules with two vacancies in the innermost shell can be studied using synchrotron light in combination with our coincidence technique. The chemical shifts of S 2p DCHs are investigated for the molecules CS2, H2S and SO2 and the influence of relaxation effects on the shifts are estimated. In the studies of atoms, the main focus is on the processes leading to double and higher degrees of ionization, and the final state populations. In cadmium double photoionization in the photon energy region 40-200 eV occurs mainly by indirect ionization via valence ionized satellite states and through Coster-Kronig decay of inner shell hole states. In valence-valence ionization of krypton by 88 eV photons both direct and indirect ionization processes are found to be important. For the indirect pathways strong final state selectivity in the autoionization decays of the intermediate states is observed. Triple ionization of krypton via intermediate core-valence doubly ionized states is investigated. The intermediate states are observed in the energy region 120-125 eV, and their decay to states of the triply charged ion is mapped. Experimental and theoretical results on the formation of 2p double hole states in argon are presented.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2013. 61 p.
Keyword
photoionization, multiple ionization, autoionization, synchrotron radiation, electron coincidence spectroscopy
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-89601 (URN)978-91-7447-710-8 (ISBN)
Public defence
2013-06-07, Lecture Hall FB42, AlbaNova University Center, Roslagstullsbacken 21, Stockholm, 13:00 (English)
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Supervisors
Note

At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 4: Manuscript.

Available from: 2013-05-16 Created: 2013-05-01 Last updated: 2013-05-13Bibliographically approved

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