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Molecular frame photoelectron angular distributions for core ionization of ethane, carbon tetrafluoride and 1,1-difluoroethylene

  • Author(s): Menssen, A
  • Trevisan, CS
  • Schöffler, MS
  • Jahnke, T
  • Bocharova, I
  • Sturm, F
  • Gehrken, N
  • Gaire, B
  • Gassert, H
  • Zeller, S
  • Voigtsberger, J
  • Kuhlins, A
  • Trinter, F
  • Gatton, A
  • Sartor, J
  • Reedy, D
  • Nook, C
  • Berry, B
  • Zohrabi, M
  • Kalinin, A
  • Ben-Itzhak, I
  • Belkacem, A
  • Dörner, R
  • Weber, T
  • Landers, AL
  • Rescigno, TN
  • McCurdy, CW
  • Williams, JB
  • et al.

Molecular frame photoelectron angular distributions (MFPADs) are measured in electron-ion momentum imaging experiments and compared with complex Kohn variational calculations for carbon K-shell ionization of carbon tetrafluoride (CF4), ethane (C2H6) and 1,1-difluoroethylene (C2H2F2). While in ethane the polarization averaged MFPADs show a tendency at low energies for the photoelectron to be emitted in the directions of the bonds, the opposite effect is seen in CF4. A combination of these behaviors is seen in difluoroethylene where ionization from the two carbons can be distinguished experimentally because of their different K-shell ionization potentials. Excellent agreement is found between experiment and simple static-exchange or coupled two-channel theoretical calculations. However, simple electrostatics do not provide an adequate explanation of the suggestively simple angular distributions at low electron ejection energies.

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