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

Journal article
Authors J. H. D. Eland
Raimund Feifel
Published in Journal of Chemical Physics
Volume 151
Issue 11
ISSN 0021-9606
Publication year 2019
Published at Department of Physics (GU)
Language en
Keywords configuration-interaction, auger spectrum, decay, field, dcl, Chemistry, Physics
Subject categories Physical Sciences


The triple ionization of HCl by double Auger decay and related processes has been studied using a multiparticle 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 ionized intermediate states. One indirect Auger process involves autoionization from superexcited states of Cl+. Double Auger decay from HCl+ (2p(-1), P-2(J)), 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 ionization 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. A 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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