Role of tunnelling in reactions of electron transfer in initial stages of radiolysis of condensed media

It is shown that the efficiency, of an acceptor in reducing the yield of esub(sol)sup(-) is proportional to tausub(s), the electron solvation time. This result suggests that the reactive precursor of esub(sol)sup(-) taking part in chemical reactions under conditions of picosecond pulse radiolysis is the electron with underformed solvation shell. The electron transfer from shallow trap to acceptor proceeds by tunnelling as in the case of fully solvated state. The similarity of decay kinetics of solvating electron and that trapped at low temperatures is due to this circumstance. The equations for decay kinetics of trapped electron including trap-to-trap diffusion is obtained. It has been shown that linear decrease of H-atom concentration at low temperatures with square root of time is related to uneffective electron transfer from donor to acceptor