Photo-Induced Trapped Electron in Rigid Media : Photobleaching Study in the Mixed Polar Solvents

Abstract

An experimental study has been made on the optical absorption spectra on the photobleaching process of trapped electron (e_t⁻) produced by photoionization of tryptophan in mixed polar solvents at 77°K. The population of e_t⁻ is decreased on the photobleaching process in these solvents according to the law which can be always expressed as the sum of two first-order decays.
Two kinds of traps formed in the polar solvents have been shown to exist although the explicit mode of the trap is not clear. An assumption is presented that exchange of trapping of electron occurs between two traps on the photobleaching process of e_t⁻.