Vibronic Theory on Magnetic Properties of the Relaxed Excited State of F Center

Abstract

The magnetic properties of the relaxed excited state (RES) of the F center are investigated on the basis of the vibronic theory including the interaction with \(\varGamma_{4}^{-}\)-mode phonon; both the vibronic and the spin-orbit interactions are diagonalized. By analyzing the experimental results of the g -factor in the RES, the magnetic circular polarization in emission, and the temperature dependence of radiative lifetime of the RES, the vibronic parameter values and the spin-orbit interaction constant, λ, are determined consistently for KF, KCl and KBr. The results show that 1) λ-values in the RES are positive and have the same order of magnitude as those in the unrelaxed excited state; 2) the orbital g -factors are reduced appreciably; 3) the spin polarization in the RES, P * , is of the relatively small order of 10 -3 . An alternative method to estimate P * is proposed.