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ON THE ORIGIN OF LASER‐SPECIFIC LUMINESCENCE UPON PULSED‐LASER EXCITATION OF BENZOPHENONES IN FREONS †
Author(s) -
Clark K. Brady,
Scaiano J. C.
Publication year - 1989
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.1751-1097.1989.tb05560.x
Subject(s) - benzophenone , photochemistry , phosphorescence , chemistry , freon , luminescence , laser , excimer , excited state , moiety , excitation , fluorescence , optoelectronics , materials science , optics , organic chemistry , atomic physics , physics , electrical engineering , engineering
Abstract –Excimer laser excitation (308 nm) of benzophenone in Freon‐113, as well as in Freon‐11, results in an intense emission with λ max at approx. 530 nm in addition to triplet phosphorescence. This emission is shown to result from an excited free radical bearing the diphenylmethylene moiety which is generated in a two‐photon process and which luminesces upon sensitization by the benzophenone triplet. On the basis of its spectroscopic properties and the chemical nature of the system, it is suggested that the fluorescer in this system may be the hypochlorite radical, Ph 2 COCl.