Lahmam-Bennani, A., Duguet, A., Taouil, I., Gaboriaud, M. N., Avaldi, L., Berakdar, J. and Kheifets, A.
In: The Physics of Electronic and Atomic Collisions pp 431-435 (Eds.) Itikawa, Y., Okuno, K., Tanaka, H., Yagishita, A. and Matsuzawa, M., AIP Press, New York, USA 2000We have measured for the first time full sets of coplanar (e,3e) angular distributions for double ionization of He, at an impact energy of ~ 5 and ~ 1 keV. Ejected electrons are detected with equal energies, 10 and 4 eV. Comparison is made with analog (g,2e) results, and deviations from the dipolar limit are pointed out. The data are also compared with two calculations, using either a four-body final-state wavefunction for the three electrons moving in the field of He2+, or the convergent close coupling method.
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