抄録
Additively colored crystals of KC1 have been irradiated, at temperatures in the vicinity of room temperature, with the F-band light which is absorbed almost completely by the crystals. The rate of formation of M centers varies as the 1.34 th power of the concentration of F centers, and as the 0.65 th power of the irradiation intensity. It has a temperature dependence with the thermal activation energy of 0.41 eV. The study of the formation of R centers in the presence of M centers suggests that the mobile species in the crystal is the anion vacancy.
By using the reaction kinetics, the rate of formation of M centers has been analysed. The results are found to be consistent with Delbecq’s suggestion that an anion vacancy migrates to an F center to form an M+ center which on capturing an electron becomes an M center. A similar mechanism for the formation of R centers is also suggested.
