Temperature Dependence of the Radiation-Induced Dynamic Motion of Interstitial Halogen in Alkali Halides

Formation of the H , H A , H Z and V 4 centers in pure, Na + -doped or Ca ++ -doped KBr has been measured within the time constant of the thermal annihilation of the H center between 80 K and 200 K using the flush radiolysis technique. It has been found that the interaction volumes of the radiation-induced dynamic motion of the interstitial halogen with a Na + impurity, a Ca ++ impurity of an H center increase with an activation energy, 0.03 eV between 80 K and 200 K. It is pointed out that the increase in the interaction volume with temperature is due to the increases in the average range of the replacement sequence and that the increase in the average range explains the increase in the F center production efficiency between 80 K and 200 K.