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THE ROLE OF A PHOTOCHEMICAL REACTION ON THE DEACTIVATION OF EXCITED 4,5′,8‐TRIMETHYLPSORALEN IN ETHANOL
Author(s) -
Ishikawa Mitsuru,
Kikuchi Koichi,
Kokubun Hiroshi
Publication year - 1983
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1983.tb03607.x
Subject(s) - photochemistry , excited state , absorbance , chemistry , fluorescence , singlet state , ethanol , yield (engineering) , absorption (acoustics) , quantum yield , triplet state , singlet fission , organic chemistry , atomic physics , molecule , materials science , optics , chromatography , physics , metallurgy , composite material
— 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 φ F for TMP and on the initial absorbance D R of R were studied and it was found that D R increases with increasing temperature whereas φ F decreases. These results indicate that a photochemical reaction plays an important role on the deactivation of TMP in the excited singlet state