Physical Review Research (Jul 2020)

Revealing the two-electron cusp in the ground states of He and H_{2} 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

DOI
https://doi.org/10.1103/PhysRevResearch.2.033080
Journal volume & issue
Vol. 2, no. 3
p. 033080

Abstract

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We report on kinematically complete measurements and ab initio nonperturbative calculations of double ionization of He and H_{2} by a single 800 eV circularly polarized photon. We confirm the quasifree mechanism of photoionization for H_{2} 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.