Compton profile studies of amorphous and polycrystalliae arsenic

The profile of the valence-band density of states of amorphous arsenic (a-As) looks quite similar to that of polycrystalline As. However, in two areas there are some differences, one near the Fermi level and one in the middle of the s-band (about - 12 eV binding energy). In both cases the density of states is larger for a-As than it is for the polycrystalline As; this is especially the case in the middle of the s-band where the density of states of a-As does not show the sharp minimum found for polycrystalline As. These differences in the valence states have been found in the γ-ray Compton profile studies of amorphous and crystalline As.