Reaction control by the accerelation and the decerelation of the intersystem crossing by microwave irradiation.

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In this project we have tried to clear the effect of the microwave irradiation on the spin correlation of the radical pair (RP), and to control the photochemical reaction by this effect. For these purpose, we performed the investigation on the following subjects. (1) Construction of the new time-resolved RYDMR (Reaction Yield Detected Magnetic Resonance) and SNP (Stimulate Nuclear Polarization) detection system. For the investigation of the spin correlation of the radical pair, we need a method to observe the spin correlation in fast time resolution (-ns). We apply the various techniques (detection of emission, transient absorption, nuclear polarization, and photo-conductivity) for the observation of the microwave effect on the dynamics of the radical pair. (2) Discussion of the time-resolved ADMR spectra observed in the polymethylene-linked xanthone and xanthene. (3) Observation of the effect of the pulsed microwave on the spin dynamics of RP.(4) The spin dynamics of the RP in the micellar supercage studied by the time-resolved ESR and the stimulated nuclear polarization (SNP) spectra.