OFF-NORMAL INCIDENCE PIEZOREFLECTIVITY OF SRF2 AND BAF2 IN THE CORE EXCITON REGION

Off-normal incidence piezoreflectivities of SrF2 and BaF2 in the 4p and 5p core exciton regions have been measured. The cubic, tetragonal and trigonal deformation potentials are determined. The results are interpreted by the localized excitation model; signs and magnitudes of the deformation potentials of the core excitons, as well as their energies and intensities. Slater-Condon parameters, and Coulomb and exchange interactions between electrons and holes are reasonably determined.