The near-edge structure in inner-shell spectroscopy is a product of the slowly varying matrix element and the appropriate projected density of states. We have made use of the self-consistent pseudo-atomic-orbital band-structure–calculation method to produce accurate projected density of states. Our calculation is in good agreement with the K near-edge structure of diamond, silicon, cubic SiC, and ${\mathrm{Be}}_2$C, and the L near-edge structure of Si and SiC. We found for the diamond K near-edge structure that the reported core exciton does not affect the near-edge structure at an energy resolution of about 1 eV. We also show, for the first time, that Si $L_2$,3 near-edge structure can be interpreted using a ground-state model and that the s-projected density of states is significant near threshold.

• Received 13 February 1989

DOI:https://doi.org/10.1103/PhysRevB.40.5694