Revealing the Two-Electron Cusp in the Ground States of He and H2 via Quasifree Double Photoionization
physics.atom-ph
/ Authors
S. Grundmann, V. Serov, F. Trinter, K. Fehre, N. Strenger, A. Pier, M. Kircher, D. Trabert, M. Weller, J. Rist
and 8 more authors
L. Kaiser, A. W. Bray, L. Ph. H. Schmidt, J. B. Williams, T. Jahnke, R. Dörner, M. S. Schöffler, A. S. Kheifets
/ Abstract
We report on kinematically complete measurements and ab initio non-perturbative 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 new method for mapping electrons relative to each other and provides valuable insight into photoionization beyond the electric-dipole approximation.