NewF-Type Color Center in CsBr Crystals Doped withCl−Ions

A new absorption band consisting of two components is found in additively colored CsBr crystals doped with ${\mathrm{Cl}}^{-}$ ions. It is suggested that the corresponding color center, called $F_H$, consists of an $F$ center adjacent to a ${\mathrm{Cl}}^{-}$ ion. Dichroic bleaching properties are described. The luminescence is characterized by a single Gaussian emission band, peaking at 1.5 eV and with a half-width of 0.17 eV. The temperature dependence of the emission is different for the two components of the excitation spectrum.