Two-photon absorption is used to measure the shift of the longitudinal Z₃ and Z1,2 excitons and the 2p exciton in CuCl under hydrostatic pressure. Hydrostatic deformation potentials for excitons and band states are determined with high accuracy. In CuBr the shift of the longitudinal Z1,2 exciton is measured, showing a pronounced superlinear pressure dependence. In the high-pressure phase (above 4 GPa) the pressure dependence of luminescence is observed up to 9 GPa in both compounds.
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Reimann et al. (1994) studied this question.
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