Abstract
Piezoreflectance spectra of rubidium chloride were measured in the photon energy range from 6 to 30 eV at about 120 K. For the structure at 9.01 eV, cubic piezoreflectivity spectrum do not have line shape proportional to that of the logarithmic energy derivative of reflectivity spectrum, and both of tetragonal and trigonal responses on piezoreflectivity were observed. We ascribed it to a composite of the L and X excitons. The piezoreflectance responses of the core excitons located between 15 and 18.5 eV are interpreted well by the localized excitation model by Satoko and Sugano.
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