Vibronic Scheme of the Relaxed Excited State of the F Center

Abstract

The vibronic scheme of the relaxed excited state (RES) of the F center which includes the \(2 \varGamma_{1}^{+}\), \(\varGamma_{3}^{+}\), and \(\varGamma_{4}^{-}\)-mode interactions has been developed. Formulae of the morphic effects have been derived. The vibronic parameter values for NaF, KF, KCl, KBr, RbF, RbCl, and RbBr are determined from the consistent analysis of the temperature dependence of the radiative lifetime and of the Stark polarization. Available data of the temperature dependence of the stress-induced polarization are consistently explained. Using parameter values, the dipole moment and stress coupling coefficient (\(\varGamma_{3}^{+}\)-mode) are determined; the red Stark shift is interpreted. By including the spin-orbit interaction, the forms of the magnetic effects are derived. The spin-orbit interaction constant, the orbital g -factor, and the spin polarization in the RES are determined from the analysis of experimental data.