Abstract
Characteristic features of the time-resolved fourier transform EPR (FT-EPR) and electron spin echo FT-EPR (ESE-FT-EPR) spectroscopies for studies of photochemical reaction kinetics are summarized in comparison with the cw-time-resolved EPR (CW-TREPR) spectroscopy. The former two methods were applied to study the photoinduced electron transfer reaction between zinc tetraphenylporphyrin (ZnTPP) and benzoquinone (BQ) in 2-butanol. It is shown that deuterium substitution of the compounds and an application of the ESE-FT-EPR method are effective to observe the broad EPR spectrum of the ZnTPP cation which is missed in measurements by FT-EPR. The kinetic data obtained for the deuterated and undeuterated compounds are compared.
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