Dynamical theory of Auger induced desorption

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Abstract
The high ion yield observed in Auger induced desorption from many surfaces was explained by Knotek and Feibelman as an effect of hole-hole correlation related to the long lifetime of two-hole resonances. Here, the probability that the desorbing atom with two valence holes escapes without being reneutralized is obtained from the exact solution of a time-dependent, interacting Anderson model. If the relevant electronic states are below the Fermi level the dynamics of electrons is governed by a pair of closed integral equations. For illustration, the equations are solved in detail in the surface-molecule limit. The theory accounts for the Knotek-Feibelman mechanism and reveals a complicated dependence of the probability of ionic desorption on ion velocity and hole-hole repulsion. Moreover, the results show a close relationship between Auger induced desorption and the Auger line shape.