Revealing the two-electron cusp in the ground states of He and H2 via quasifree 
double photoionization

Grundmann, Sven; Serov, Vladislav V.; Trinter, Florian; Fehre, Kilian; Strenger, Nico; Pier, Andreas; Kircher, Max; Trabert, Daniel; Weller, Miriam; Rist, Jonas; Kaiser, Leon; Bray, Alexander W.; Schmidt, Lothar Ph. H.; Williams, Joshua B.; Jahnke, Till; Dörner, Reinhard; Schöffler, Markus S.; Kheifets, Anatoli S.

doi:10.1103/PhysRevResearch.2.033080

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Revealing the two-electron cusp in the ground states of He and H₂ via quasifree double photoionization

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Trinter, Florian
Photon Science, Deutsches Elektronen-Synchrotron (DESY);
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Grundmann, S., Serov, V. V., Trinter, F., Fehre, K., Strenger, N., Pier, A., et al. (2020). Revealing the two-electron cusp in the ground states of He and H₂ via quasifree double photoionization. Physical Review Research, 2(3): 033080. doi:10.1103/PhysRevResearch.2.033080.

Cite as: https://hdl.handle.net/21.11116/0000-0006-BC2F-3

Abstract

We report on kinematically complete measurements and ab initio nonperturbative calculations of double ionization of He and H₂ by a single 800 eV circularly polarized photon. We confirm the quasifree mechanism of photoionization for H₂ and show how it originates from the two-electron cusp in the ground state of a two-electron target. Our approach establishes a method for mapping electrons relative to each other and provides valuable insight into photoionization beyond the electric-dipole approximation.