2色-2レーザー光パルスを用いたdiphenyl disulfideの2光子イオン化

概要

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Formation of radical cation during resonant two-photon ionizations (TPI) of diphenyl disulfide (DPDS) in solvent was studied with transient absorption measurement using 266-nm and 532-nm laser flash photolysis technique. Ionization of DPDS occurred within the laser flash (5 ns) to give the radical cation (DPDS^<-+>) and solvated electron (e^-_<solv>) in a quantum yield of 7.9%. Excitation of DPDS with a 532-nm laser (second laser pulse) resulted in the formation of transient absorption of e^-_<solv> with a quantum yield (φ_<ion>) of 19.2%. The φ_<ion> of e^-_<solv> increased approximately 2.5 times with second 532-nm laser excitation of phenylthiyl radical.