The anomalous edge behavior in the appearance-potential spectroscopy of simple metals has been investigated. With the use of simple diagrams and a realistic pseudopotential for the core-hole interaction, the Nozières–De Dominicis–Laramore theory has been extended beyond the immediate neighborhood of the edge region. It is shown that close to the edge, this theory reduces to the same power-law expression as calculated by Laramore. Away from the edge, numerical results are presented for both 1s and 2p intensity spectra of Al. Derivative spectra are also calculated numerically. The resulting singularities and widths of the edge structures in both 1s and 2p derivative spectra are consistent with experimental data.

• Received 17 June 1985

DOI:https://doi.org/10.1103/PhysRevB.32.6286