Abstract
Experimental and theoretical studies of the energy spectra of electrons ejected in ${\mathrm{H}}^{\ensuremath{-}}\text{\ensuremath{-}}\mathrm{He}$ 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 $1{s}^{\ensuremath{'}}$ electron of ${\mathrm{H}}^{\ensuremath{-}}$ in the course of superpromotion of the inner $1s$ electron.
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