Yv. Popov et al., ON THE MECHANISMS OF (E, 3E) COLLISIONS WITH FAST PROJECTILES, Journal of physics. B, Atomic molecular and optical physics, 27(8), 1994, pp. 1599-1612
The contributions of the so-called shake-off and two step mechanisms t
o the fivefold differential cross section of the double ionization of
helium are studied and compared to recent theoretical results. A simpl
e qualitative model for the estimation of the contribution of both mec
hanisms is proposed for experimentators. The predictions reproduce qua
litatively the results of more elaborate theoretical calculations.