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Single-photon double and triple ionization of acetaldehyde (ethanal) studied by multi-electron coincidence spectroscopy

Journal article
Authors Sergey Zagorodskikh
Vitali Zhaunerchyk
M. Mucke
John H. D. Eland
Richard J. Squibb
L. Karlsson
P. Linusson
Raimund Feifel
Published in Chemical Physics
Volume 463
Pages 159-168
ISSN 0301-0104
Publication year 2015
Published at Department of Physics (GU)
Pages 159-168
Language en
Links dx.doi.org/10.1016/j.chemphys.2015....
https://gup.ub.gu.se/file/181283
Keywords Acetaldehyde, Double ionization, Site-specific Auger decay, Triple ionisation
Subject categories Atom and Molecular Physics and Optics

Abstract

Single-photon multiple ionization processes of acetaldehyde (ethanal) have been experimentally investigated by utilizing a multi-particle coincidence technique based on the time-of-flight magnetic bottle principle, in combination with either a synchrotron radiation source or a pulsed helium discharge lamp. The processes investigated include double and triple ionization in the valence region as well as single and double Auger decay of core-ionized acetaldehyde. The latter are studied site-selectively for chemically different carbon core vacancies, scrutinizing early theoretical predictions specifically made for the case of acetaldehyde. Moreover, Auger processes in shake-up and core-valence ionized states are investigated. In the cases where the processes involve simultaneous emission of two electrons, the distributions of the energy sharing are presented, emphasizing either the knock-out or shake-off mechanism. © 2015 Published by Elsevier B.V.

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