A Lahmam-Bennani et al 2001 J. Phys. B: At. Mol. Opt. Phys. 34 3073 doi:10.1088/0953-4075/34/15/313
A Lahmam-Bennani1,5, A Duguet1, M N Gaboriaud1, I Taouil1, M Lecas1, A Kheifets2, J Berakdar3 and C Dal Cappello4
Show affiliationsThe 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-of-the-art calculations. For high incident energy 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.
Issue 15 (14 August 2001)
Received 29 January 2001, in final form 25 May 2001
Published 23 July 2001
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