Abstract
The absorption spectra of the alkali and the cuprous halides under hydrostatic pressure were measured at room temperature. The first exciton peak shows a linear blue shift with increasing pressure. Ionic index I for ionic crystals and cubic semiconductors is defined and estimated. It is found that the ionic index I is almost 1 for the alkali halide. As the ratio of the covalent bond to the ionic bond increases, the ionic index I becomes smaller than 1.
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