Optical absorption spectra of the Bi+ impurity center in CsCdBr3 ternary bromide

Optical absorption spectra of the Bi+ impurity center isomorphically substituting Cs+ in CsCdBr3 are recorded over a wide temperature range (from 3.2 to 300 K). An analysis of the vibrational degrees of freedom of the impurity center within the framework of the model of a single effective phonon mode yields various spectroscopic parameters of the optical transition in the Bi+ ion, such as the zero-phonon transition energy, Huang–Rhys parameter, and effective phonon energy. The results are used to compare the properties of the Bi+ center in various crystalline matrices.