Complete experiments for the double ionization of He: (e,3e) cross sections at 1 keV impact energy and small momentum transfer

A Lahmam-Bennani, A Duguet, M N Gaboriaud, I Taouil, M Lecas, A Kheifets, J Berakdar, C Dal Cappello
2001 Journal of Physics B: Atomic, Molecular and Optical Physics  
The relative, coplanar angular distributions of electrons, produced in an electron-impact double ionization of helium (e, 3e reaction), have been measured at 1.1 keV impact energy. The momentum transfer was 0.45 au and the two 'ejected' electrons were detected with the same energy of 10 eV. The general features of the angular distributions are discussed. The data are analysed in different angular modes which allows a detailed comparison with state-ofthe-art calculations. For high incident
more » ... and small momentum transfer, as in the present case, the (e, 3e) cross section can be related to the single-photon double ionization (PDI). We exploit this fact and compare the present findings with the PDI and identify the contribution of non-dipole effects.
doi:10.1088/0953-4075/34/15/313 fatcat:pz2rv2iffncsjnktmluaioew4q