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Double Core Hole Creation and Subsequent Auger Decay in NH3 and CH4 Molecules
Stockholm University, Faculty of Science, Department of Physics.
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2010 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 105, no 21, 213005- p.Article in journal (Refereed) Published
Abstract [en]

Energies of the hollow molecules CH42+ and NH32+ with double vacancies in the 1s shells have been measured using an efficient coincidence technique combined with synchrotron radiation. The energies of these states have been determined accurately by high level electronic structure calculations and can be well understood on the basis of a simple theoretical model. Their major decay pathway, successive Auger emissions, leads first to a new form of triply charged ion with a core hole and two valence vacancies; experimental evidence for such a state is presented with its theoretical interpretation. Preedge 2-hole-1-particle (2h-1p) states at energies below the double core-hole states are located in the same experiments and their decay pathways are also identified.

Place, publisher, year, edition, pages
2010. Vol. 105, no 21, 213005- p.
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-51333DOI: 10.1103/PhysRevLett.105.213005ISI: 000284407400011OAI: oai:DiVA.org:su-51333DiVA: diva2:385054
Note

authorCount :6

Available from: 2011-01-11 Created: 2011-01-10 Last updated: 2017-12-11Bibliographically 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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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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