Parametrization of energy sharing distributions in direct double photoionization of He
Andersson, J.; Zagorodskikh, S.; Roos, A. Hult; Talaee, O.; Squibb, R. J.; Koulentianos, D.; Wallner, M.; Zhaunerchyk, V.; Singh, R.; Eland, J. H. D.; Rost, J. M.; Feifel, R. (2019-11-29)
Andersson, J., Zagorodskikh, S., Roos, A.H. et al. Parametrization of energy sharing distributions in direct double photoionization of He. Sci Rep 9, 17883 (2019). https://doi.org/10.1038/s41598-019-53545-z
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https://urn.fi/URN:NBN:fi-fe202002286838
Tiivistelmä
Abstract
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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