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Parametrization of energy sharing distributions in direct double photoionization of He

Journal article
Authors Jonas Andersson
Sergey Zagorodskikh
Andreas Hult Roos
Omid Talaee
Richard J. Squibb
Dimitris Koulentianos
Måns Wallner
Vitali Zhaunerchyk
Raj Singh
John H. D. Eland
Jan Michael Rost
Raimund Feifel
Published in Scientific Reports
Volume 9
ISSN 2045-2322
Publication year 2019
Published at Department of Physics (GU)
Language en
Subject categories Atomic physics


We present experimental results on the characteristic sharing of available excess energy, ranging from 11–221 eV, 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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