Mechanisms of Photo Double Ionization of Helium by 530 eV Photons

A. Knapp, A. Kheifets, I. Bray, Th. Weber, A. L. Landers, S. Schössler, T. Jahnke, J. Nickles, S. Kammer, O. Jagutzki, L. Ph. H. Schmidt, T. Osipov (+5 others)
2002 Physical Review Letters  
We have measured fully differential cross sections for photo double ionization of helium 450 eV above the threshold. We have found an extremely asymmetric energy sharing between the photoelectrons and an angular asymmetry parameter b Ӎ 2 and b Ӎ 0 for the fast and slow electrons, respectively. The electron angular distributions show a dominance of the shakeoff for 2 eV electrons and clear evidence of an inelastic electron-electron scattering at an electron energy of 30 eV. The data are in
more » ... ent agreement with convergent close-coupling calculations.
doi:10.1103/physrevlett.89.033004 pmid:12144390 fatcat:j7wrzq7x4vgafd4ugnjhox42ey