Abstract
Time evolution in msec region, temperature dependence, and excitation photon energy dependence of the photoinduced absorption spectra of wide gap MX-chain complexes have been measured. It has been found that the photoinduced absorption bands are caused by three states: the photo-generated neutral soliton pair, the polaron pair, and a state the origin of which is not clear. Neutral soliton pairs are most efficiently generated from the charge transfer excitons. Polaron pairs are generated only from the higher excited states. It is found that the generation of the self-trapped excitons and that of the neutral soliton pairs compete with each other in the relaxation processes of the charge transfer excitons.
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