Abstract
Pressure dependence of optical absorption spectra of Γ excitons in alkali bromide thin films, NaBr, KBr and RbBr, was measured at room temperature. The exciton energies showed linear blue shifts while the absorption intensities decreased with increasing pressure. In order to further understand the experimental results, the pressure dependence of the absorption intensities is discussed in terms of the pressure dependence of Bohr radius by Elliott's theory and exchange interaction between electron and hole by Onodera and Toyozawa's theory. We speculate that the Bohr radii increase and the exchange energies decrease as the pressure increases for the Γ3/2 and the Γ1/2 excitons in the alkali bromides.
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