University of Oulu

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).

Parametrization of energy sharing distributions in direct double photoionization of He

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Author: Andersson, J.1; Zagorodskikh, S.1,2; Roos, A. Hult1;
Organizations: 1Department of Physics, University of Gothenburg, Origovägen 6B, 412 96, Gothenburg, Sweden
2Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20, Uppsala, Sweden
3Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, FI-90014 University of Oulu, Oulu, Finland
4Sorbonne Université, CNRS, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005, Paris, Cedex 05, France
5Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot, 7610001, Israel
6Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, United Kingdom
7Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, D-01187, Dresden, Germany
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.3 MB)
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Language: English
Published: Springer Nature, 2019
Publish Date: 2020-02-28


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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Series: Scientific reports
ISSN: 2045-2322
ISSN-E: 2045-2322
ISSN-L: 2045-2322
Volume: 9
Article number: 17883
DOI: 10.1038/s41598-019-53545-z
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: This work has been financially supported by the Swedish Research Council (VR) and the Knut and Alice Wallenberg Foundation, Sweden.
Copyright information: © The Author(s) 2019. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit