Lahmam-Bennani, A., Taouil, I., Duguet, A., Lecas, M., Avaldi, L. and Berakdar, J.

Using a multiparameter multicoincidence spectrometer, we have measured the coplanar (e,3e) angular distributions following the double ionization of helium at an incident energy of ~5.6 keV and under a small projectile's scattering angle of 0.45°. The two ejected electrons have been detected with equal energies E_b=E_c=10 eV. The absolute value of the cross section is determined with an accuracy of 25 %. The origin of dips and peaks in the spectra is exposed by analyzing the corresponding theoretical calculations. These calcu-lations have been done using a four-body final-state wave function for the three electrons moving in the field of He²⁺. The dipolar limit is investigated and the manifestation of the deviation from this limit are pointed out. General features and possible trends for other targets are proposed.

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