Abstract
The structure of the conduction and valence bands near the Brillouin-zone center has been calculated for the II-IV-V2 chalcopyrite compounds by using a model obtained by adding an anisotropic crystal potential to the Hamiltonian of the Kane model for III-V compounds. The model, reuiring only four readily obtainable parameters, is applied to CdGeAs2 to calculate effective masses and intervalence-band absorption cross sections. The theoretical results are in good agreement with experimental values.