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Mechanisms of site-specific photochemistry following core-shell ionization of chemically inequivalent carbon atoms in acetaldehyde (ethanal)

Journal article
Authors Sergey Zagorodskikh
John H. D. Eland
Vitali Zhaunerchyk
Melanie Mucke
Richard J. Squibb
Per LInusson
Raimund Feifel
Published in Journal of Chemical Physics
Volume 145
Issue 12
Pages artikel nr 124302
ISSN 0021-9606
Publication year 2016
Published at Department of Physics (GU)
Pages artikel nr 124302
Language en
Subject categories Atom and Molecular Physics and Optics, Physical Sciences


Site-specific fragmentation upon 1s photoionisation of acetaldehyde has been studied using synchrotron radiation and a multi-electron-ion coincidence technique based on a magnetic bottle. Experimental evidence is presented that bond rupture occurs with highest probability in the vicinity of the initial charge localisation and possible mechanisms are discussed. We find that a significant contribution to site-specific photochemistry is made by different fragmentation patterns of individual quantum states populated at identical ionisation energies.

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