Electronic density of states and bonding in chalcopyrite-type semiconductors

Measured x-ray-photoemission spectra for ZnGe${\mathrm{P}}_2$ and CdSn${\mathrm{As}}_2$ are presented along with density-of-states $N\mathrm{}\left(E\right)\mathrm{}$ and charge-density calculations for ZnGe${\mathrm{P}}_2$. Analysis of the density-of-states spectra illustrates the relation between $N\mathrm{}\left(E\right)\mathrm{}$ structure and bonding properties, allowing spectral peaks to be assigned to specific bonds.