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

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

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)

    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.

    Original languageEnglish
    Article number033080
    JournalPhysical Review Research
    Volume2
    Issue number3
    DOIs
    Publication statusPublished - Jul 2020

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