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

• 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 112% 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 73.80.5 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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NATURVETENSKAP  -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)

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