“…Both conventional (Grossweiner et al, 1963;Grossweiner a n d Usui, 1971;Santus and Grossweiner, 1972;Subramanyan and Tollin, 1972;Pailthorpe et al, 1973;Templer and Thistlethwaite, 1976) and laser flash photolysis (Bent and Hayon, 1975;Bryant et al, 1975;Baugher and Grossweiner, 1977;Volkert etal., 1977) have been extensively used to investigate the solution phase photophysics of Trp and its derivatives. In these experiments transient absorption spectra in H 2 0 of e; , (A, , , = 650 nm), the radical cation.…”