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Long-Range Interatomic Coulombic Decay in ArXe Clusters: Experiment and Theory
Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany.;Tech Univ Berlin, Inst Opt & Atomare Phys, Hardenbergstr 36, D-10623 Berlin, Germany..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics. Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany..
Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany.;DESY, Ctr Free Electron Laser Sci, Notkestr 85, D-22607 Hamburg, Germany..
Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany..
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2016 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 120, no 40, 22957-22971 p.Article in journal (Refereed) Published
Abstract [en]

We report autoionization channels of Ar inner valence ionized states in mixed AtXe dusters and compare our experimental data obtained by electron electron-electron coincidence spectroscopy to our theoretical simulations for representative cluster structures. The combined experimental and theoretical data show that the autoionization of Ar 3s(-1) in ArXe is dominated by interatomic coulombic decay(ICD) to Xe atoms in the second and higher coordination shells of the originally excited atom. Clusters with a range of sites, compositions, and structures were probed. The Xe content in the clusters was varied between 10% and 53%. Besides ICD, also electron transfer mediated, decay (ETMD(3)) was found important in many of the calculated spectra, although it is seen with less intensity in the experimental spectra. From the calculations, we identify structural motifs in which the ETMD rate is minimized vs the ICD rate and suggest that these are preferentially realized in our experiment in which clusters are formed by supersonic expansion of an Ar-Xe mixture. Suggested cluster structures either feature a dear segregation between Ar and Xe fractions, e.g., Xe core-Ar shell systems, or contain a few Xe atoms singled out at surface sites on an Ar cluster. These structures differ significantly from the majority of calculated minimum energy structures for ArXe systems of 38 atoms, which might show that the latter, annealed structures are not realized in our experiment. We show experimentally that the relaxation of Ar inner valence states by ICD and ETMD together has an efficiency of unity, within the experimental accuracy, for all dusters probed, except those with the lowest Xe content. The outer valence photoelectron spectra of ArXe are discussed also.

Place, publisher, year, edition, pages
2016. Vol. 120, no 40, 22957-22971 p.
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-307537DOI: 10.1021/acs.jpcc.6b06665ISI: 000385607000022OAI: oai:DiVA.org:uu-307537DiVA: diva2:1047335
Funder
German Research Foundation (DFG), 1789
Available from: 2016-11-17 Created: 2016-11-17 Last updated: 2016-11-17Bibliographically approved

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Mucke, Melanie
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