Abstract
Absorption edges associated with nearly parallel bands, proposed by Ehrenreich, Philipp, and Segall for aluminum, are discussed for the general case. Numerical estimates of the position, form, and strength of such edges are made for all polyvalent metals with simple structures. It is noted further that such edges provide a direct measurement of the magnitude of the orthogonalized-plane-wave form factor, or pseudopotential, for the metal.

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