Abstract
The mechanism of electron correlation during the post-collision interaction following the electron impact excitation and decay of autoionising states is discussed. It is suggested that the correlation mechanism in some cases results in an exchange of orbital angular momentum between the scattered and the ejected electrons. Experimental results on helium showing the decay of the (2s2p2)2D He- resonance to the (2s2)1S autoionising state are presented. It is pointed out that the observation of this resonance in the excitation of the (2s2)1S state provides evidence for angular momentum exchanges between the outgoing electrons.
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