| 1. |
- Andersson, Jonas, et al.
(author)
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Parametrization of energy sharing distributions in direct double photoionization of He
- 2019
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In: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 9
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Journal article (peer-reviewed)abstract
- We present experimental results on the characteristic sharing of available excess energy, ranging from 11–221eV, between two electrons in single-photon direct double ionization of He. An effective parametrization of the sharing distributions is presented along with an empirical model that describes the complete shape of the distribution based on a single experimentally determinable parameter. The measured total energy sharing distributions are separated into two distributions representing the shake-off and knock-out parts by simulating the sharing distribution curves expected from a pure wave collapse after a sudden removal of the primary electron. In this way, empirical knock-out distributions are extracted and both the shake-off and knock-out distributions are parametrized. These results suggest a simple method that can be applied to other atomic and molecular systems to experimentally study important aspects of the direct double ionization process.
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| 2. |
- Eland, John H. D., 1941, et al.
(author)
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Triple ionisation of HCl via states with a 2p core hole
- 2019
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In: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 151
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Journal article (peer-reviewed)abstract
- 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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| 3. |
- Hult Roos, Andreas, et al.
(author)
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Relative extent of triple Auger decay in CO and CO2
- 2019
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In: Physical Chemistry Chemical Physics - PCCP. - 1463-9076. ; 21, s. 9889-94
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Journal article (peer-reviewed)abstract
- Systematic measurements on single and triple Auger decay in CO and CO2 after the creation of a C 1s or a O 1s core vacancy show that the percentage of triple Auger decay is on the order of 10−2 of the single Auger decay in these molecules. The fractions of triple Auger decay are compared with triple Auger fractions for carbon atoms and some noble gas atoms, and are found to follow a linear trend correlated to the number of valence electrons on the atom with the initial core vacancy and on its closest neighbours. This linear trend for the percentage of triple Auger decay is represented by a predictive equation TA = 0.13·Nve − 0.5.
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