A CONTRADICTION BETWEEN PULSED AND STEADY-STATE STUDIES IN THE RECOMBINATION KINETICS OF CLOSE FRENKEL DEFECTS IN KBR AND KCL CRYSTALS

Theoretical study of the kinetics of the correlated annealing of pairs of close (geminate) F-H centers in KCl and KBr crystals controlled by their diffusion and elastic attraction shows that the multi-step (kin k) decay in defect concentrations observed more than once in thermosti mulated experiments takes place only for very close F-H center pairs w hich are no further than fourth nearest neighbors. On the other hand, it is demonstrated (both theoretically and experimentally) that such F -H center pairs should be destroyed by the tunneling recombination alr eady at time less-than-or-equal-to 10(-4) S, i.e. much before beginnin g of the thermostimulated experiments. Possible explanations of this c ontradiction are suggested.