Helicity Dependence of the Photon-Induced Three-Body Coulomb Fragmentation of Helium Investigated by Cold Target Recoil Ion Momentum Spectroscopy

V. Mergel; M. Achler; R. Dörner; Kh. Khayyat; T. Kambara; Y. Awaya; V. Zoran; B. Nyström; L. Spielberger; J. H. McGuire; J. Feagin; J. Berakdar; Y. Azuma; H. Schmidt-Böcking

doi:10.1103/PhysRevLett.80.5301

Helicity Dependence of the Photon-Induced Three-Body Coulomb Fragmentation of Helium Investigated by Cold Target Recoil Ion Momentum Spectroscopy

V. Mergel, M. Achler, R. Dörner, Kh. Khayyat, T. Kambara, Y. Awaya, V. Zoran, B. Nyström, L. Spielberger, J. H. McGuire, J. Feagin, J. Berakdar, Y. Azuma, and H. Schmidt-Böcking

Phys. Rev. Lett. 80, 5301 – Published 15 June 1998

Abstract

The angular and energy dependence of circular dichroism in photo-double-ionization of helium at a photon energy of 99 eV is investigated. Using cold target recoil ion momentum spectroscopy the absolute fivefold differential cross section has been obtained by a coincident measurement of the vector momenta of one electron and the recoiling ${He}^{2 +}$ ion covering all relative azimuthal and polar angles. The experimental results are contrasted with numerical calculations using different helium ground state wave functions and forms of the dipole operator.

Received 14 January 1998

DOI:https://doi.org/10.1103/PhysRevLett.80.5301

Authors & Affiliations

V. Mergel^1,*, M. Achler^1,2, R. Dörner¹, Kh. Khayyat¹, T. Kambara², Y. Awaya², V. Zoran^2,†, B. Nyström², L. Spielberger¹, J. H. McGuire^3,1, J. Feagin⁴, J. Berakdar⁵, Y. Azuma⁶, and H. Schmidt-Böcking¹

¹Institut für Kernphysik der Universität Frankfurt, August-Euler-Strasse 6, D-60486 Frankfurt, Germany
²The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama, 351-01 Japan
³Tulane University, New Orleans, Louisiana 70118
⁴California State University, Fullerton, California 92834
⁵Max-Planck Institute for Microstructure Physics, Weinberg 2, D-06120 Halle, Germany
⁶Photon Factory, IMSS, KEK, Tsukuba, Ibaraki, 305, Japan

^*Electronic address: mergel@ikf.uni-frankfurt.de
^†Deceased.