Some Problems of the Vibrational Structure of Optical Spectra of Impurities in Solids

Abstract

During the last decade in the study of the impurity spectra of solids, considerable attention has been paid to both the theoretical and experimental problems of no-phonon lines and phonon sidebands. This interest is reasonable: no-phonon lines represent clear-cut narrow spectral lines which are highly sensitive to the slightest alterations of the physical situation in the impurity centre. The ω:Δω) relation for the frequency ω broadening Δω) is often about 104 and may be even more.