The shape of the $L_{2,3}\mathrm{VV}$ Auger line has been calculated for a Si(111) surface and found to be in excellent agreement with the data of Houston and Lagally. By contrast, the experimental line shape scarcely resembles the self-fold of the occupied Si density of states, a fact which the calculation shows to be the result of matrix-element angular momentum dependence and not of "many-body" effects.

• Received 19 January 1976

DOI:https://doi.org/10.1103/PhysRevLett.36.1154