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THE PHOTO‐REACTIVITY OF AROMATIC SUBSTANCES WITH OXYGEN *
Author(s) -
Rosenberg J. L.,
Humphries Frederick S.
Publication year - 1964
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.1751-1097.1964.tb08157.x
Subject(s) - photochemistry , quenching (fluorescence) , excited state , dimer , chemistry , delocalized electron , reactivity (psychology) , oxygen , relaxation (psychology) , monomer , reaction rate constant , kinetics , fluorescence , atomic physics , organic chemistry , physics , polymer , optics , pathology , medicine , psychology , social psychology , alternative medicine , quantum mechanics
Summary The quenching reaction of oxygen with photo‐excited aromatics, although almost diffusion‐controlled in many cases, has some specific requirements with respect to the electronic details of the excited state. This is shown in the difference between the quenching constants for monomer and dimer of the same dye, where the dimer is recognized principally by excitation delocalization. Evidence is reviewed for the view that oxygen becomes vibrationally excited as a result of the quenching reaction, and that this hot oxygen is an essential intermediate in photo‐oxidations. A new result is the stimulation of O 2 quenching by CO 2 , a known catalyst for vibrational relaxation in O 2 .