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PHOTOPHYSICS OF A WELL CHARACTERIZED HUMIC SUBSTANCE
Author(s) -
Power Joan F.,
Sharma D. K.,
Langford Cooper H.,
Bonneau Roland,
JoussotDubien Jacques
Publication year - 1986
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.1751-1097.1986.tb03557.x
Subject(s) - quenching (fluorescence) , chemistry , photochemistry , singlet oxygen , absorbance , singlet state , excitation , oxygen , humic acid , solvated electron , fluorescence , radical , organic chemistry , atomic physics , chromatography , excited state , physics , fertilizer , quantum mechanics , radiolysis
— The transient absorbance observed after flash excitation of a well characterized humic substance (“Armadale” fulvic acid) may be analyzed into three components. Two arise promptly (< 20 ps) and are assigned to a solvated electron (on the basis of decay and quenching) and its corresponding radical cation (on the basis of common origin). The third is a broad featureless band which arises only after a few ns and remains for long times. It is suggested to include triplets that may sensitize singlet oxygen.