Abstract
The time evolution of the thermal bleaching of the long-lived, photogenerated midgap absorption band in a PtCl chain compound is examined in a temperature range 220--330 K. The long-lived absorption arises from kinks each confined in a segment of the PtCl chain by energy barriers of the order of 0.5 eV. Because of a random distribution of the barrier height the pair coalescence decay shows a $\mathrm{ln}t$ dependence at all temperatures in the experimental range, 0--60 min, of time $t$ after discontinuation of laser pumping.
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