Experimental and theoretical studies of energy transfer inF-center–OH−(OD−) defect pairs in KCl

Anti-Stokes Raman spectroscopy has been employed to investigate energy-transfer processes in F-center–${\mathrm{OH}}^{\mathrm{-}}$(${\mathrm{OD}}^{\mathrm{-}}$) -defect pairs in KCl. The experimental results demonstrate that at least a good part of the electronic excitation energy becomes transferred to the vibrational states of neighboring ${\mathrm{OH}}^{\mathrm{-}}$ or ${\mathrm{OD}}^{\mathrm{-}}$ ions. In contrast to the F-center–${\mathrm{CN}}^{\mathrm{-}}$-defect pairs in CsCl, only the lower (n≤2) vibrational energy levels of ${\mathrm{OH}}^{\mathrm{-}}$ or ${\mathrm{OD}}^{\mathrm{-}}$ are populated and detected. A model which considers the E-V transfer through dipole-dipole interactions is proposed to account for the observed experimental results.