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We have completed the assembly of a high powered, Q-switched Ruby laser-dye laser photolysis system in order to make measurements of the solvation times and excited state lifetimes of solvated electrons in alcohols, employing laser saturation spectroscopy. Preliminary results are reported from laser saturation studies at 694 nm of solvated electrons in ethanol and 2-propanol. The solvated electrons (es) were generated via the two-photon ionization of sdlected arenes (such as pyrene) in alcohol at 347 nm. The results are interpreted in terms of a two level saturable absorber and upper limits on the excited state lifetimes of e S are calculated. Solvation times of e in-long chain alcohols, measured independently in picosecond pulse radiolysis, showed that the time taken for the electron population to reach a fully relaxed, solvated ground state increased as the length of the.alcohol chain increased, each es spectrum exhibiting a significant blue shift. during the initial -10 10 s. The implications of the excited state lifetime data, solvation measurements, and trends in the relative Ge values at times << 10s, will be discussed in the context of electron models. Qualitative conclusions may be drawn on the nature of the electron trapping site and the solvation process in long chain alcohols.

Laser photolysis studies on the structure and photoexcited states of solvated electrons. Final report, November 1, 1973--December 31, 1974