Abstract
A theoretical model has been developed to study the direct Auger deexcitation process between two-electron states. The model is based on linear response theory. Therefore the excitations induced in the surface may be described with the surface response function. This model has been applied to calculate the Auger deexcitation rates when an excited He atom is moving parallel to an aluminum surface. More precisely, the distance and velocity dependence of the transition from the singlet states 2${\mathrm{}}^{1}$S and 2${\mathrm{}}^{1}$P to the ground state is presented. I finally compare these results with the ones obtained by using a one-electron description for the He atom. The differences between both models vanish when effective charges ${\mathit{Z}}_{\mathit{eff}}$=1.69 a.u. and ${\mathit{Z}}_{\mathit{eff}}$=1.57 a.u. are used for the 1s and the 2p states, respectively, in the one-electron model. \textcopyright{} 1996 The American Physical Society.
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