Correlated electron detachment in H{sup -}He collisions

Experimental and theoretical studies of the energy spectra of electrons ejected in H{sup -}He collisions have been performed. Comparison of calculations using the Sturmian and advanced adiabatic theories with experimental data reveals the existence of a correlated electron detachment mechanism, which yields the main contribution to formation of the high-energy part of the ejected electron energy distribution. This mechanism is associated with dynamical energy transfer to the loosely bound 1s{sup '} electron of H{sup -} in the course of superpromotion of the inner 1s electron.