Angular distributions for double photoionization of helium: Discrepancies between theory and experiment
- Physics Department, University of Southern California, Los Angeles, California 90089-0484 (United States)
- Fakultaet fuer Physik, University of Freiburg, Hermann-Herder-Strasse 3, 79104 Freiburg (Germany)
We apply two different methods to the calculation of the triply differential cross section (TDCS) for double ionization of helium. In one method, the 3C method, the final state is described by a product of 3 Coulomb continuum wave functions, while in the other method, the 2SC method, the final state is described by a product of 2 {ital screened} Coulomb wave functions employing effective charges. We present results at the energies and geometries covered in the recent experiment by Lablanquie {ital et} {ital al}. [Phys. Rev. Lett. {bold 74}, 2192 (1995)]. There are substantial discrepancies. We also comment on a recent measurement of the {ital absolute} TDCS by Schwarzkopf and Schmidt [J. Phys. B {bold 28}, 2847 (1995)]. The measured result, as originally reported, is a factor of two smaller than the value for the absolute TDCS calculated using the 2SC method. We discuss this discrepancy. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 283862
- Journal Information:
- Physical Review A, Journal Name: Physical Review A Journal Issue: 5 Vol. 53; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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