THE ROLE OF A PHOTOCHEMICAL REACTION ON THE DEACTIVATION OF EXCITED 4,5',8-TRIMETHYLPSORALEN IN ETHANOL |
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| Authors: | Mitsuru Ishikawa Koichi Kikuchi Hiroshi Kokubun |
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| Institution: | Department of Chemistry, Faculty of Science, Tohoku University, Aoba, Aramaki, Sendai 980, Japan |
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| Abstract: | The transient absorption of an intermediate R which is formed from an excited state higher than the lowest triplet state was observed in an ethanol solution of 4,5′,8-trimethylpsoralen (TMP). The temperature effects on the fluorescence yield φF for TMP and on the initial absorbance DR of R were studied and it was found that DR increases with increasing temperature whereas φF decreases. These results indicate that a photochemical reaction plays an important role on the deactivation of TMP in the excited singlet state |
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