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Triple ionisation of HCl via states with a 2p core hole

Journal article
Authors John H. D. Eland
Raimund Feifel
Published in Journal of Chemical Physics
Volume 151
Pages 114301
ISSN 0021-9606
Publication year 2019
Published at Department of Physics (GU)
Pages 114301
Language en
Subject categories Molecular physics, Atom and Molecular Physics and Optics, Physical Sciences


The triple ionisation of HCl by double Auger decay and related processes has been studied using a multi-particle coincidence technique combined with synchrotron radiation. Four contributing processes are identified, direct double Auger, two indirect double Auger decay pathways and single Auger decay from core-valence doubly ionised intermediate states. One indirect Auger process involves autoionisation from superexcited states of Cl+. Double Auger decay from HCl+ (2p-1, 2PJ), which makes up 112% of total Auger decay, is estimated to be 40% direct, 15% indirect via atomic Cl+* and 45% indirect via molecular intermediate doubly ionized states. The vertical triple ionisation energy of HCl is determined as 73.80.5 eV. Molecular field effects are found to affect the direct double Auger process as well as normal single Auger decay. Comparison between spectra of the HCl and DCl isotopomers indicates that electronic decay is faster in all the processes than molecular dissociation.

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