Abstract
Color centers have been formed by x irradiation of RbCl above the polymorphic transition pressure, and the shape of the new $F$ band at 509 m\ensuremath{\mu} in this CsCl-type structure has been examined under a pressure of 6200 atm at liquid-helium temperature. The band shows no evidence of the multiplet structure observed in the cesium halides, thus indicating that the lattice structure is not responsible for this effect. The $F$ band in CsCl has also been formed and studied under pressure at helium temperature, and the triplet components show the usual relative intensity and the characteristic $F$-band shift. No evidence of ${K}^{\ensuremath{'}}$ bands was observed for these hydrostatic pressures.
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