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Chemiluminescence of Cigarette Smoke: Salient Features of the Phenomenon
Author(s) -
Fedorova Galina F.,
Menshov Valery A.,
Trofimov Aleksei V.,
Tsaplev Yury B.,
Vasil'ev Rostislav F.,
Yablonskaya Olga I.
Publication year - 2017
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/php.12689
Subject(s) - chemiluminescence , smoke , chemistry , excited state , particulates , photochemistry , radical , cigarette smoke , chromatography , organic chemistry , atomic physics , toxicology , physics , biology
The study disclosed herein provides for the first time a detailed experimental support for the general mechanism of the cigarette‐smoke‐derived chemiluminescence, as an example par excellence of the excited‐state generation in a chemically complex aerosol medium. The mechanism involves chemiexcitation in a unimolecular transformation of the smoke‐borne free radical species. However, the concentration of these radicals, [ r ∙ ] , obeys a bimolecular (second‐order) kinetics and depends on a particulate‐phase content (total particulate matter, TPM) of the cigarette smoke. The decrease in [ r ∙ ] with increasing the TPM amount manifests radical‐scavenging propensity of the smoke particulate phase. Astonishingly, no energy transfer takes place from the primary excited light‐emitting species to luminophoric molecules abundant in the smoke. The reported results build up fundamentals of a facile chemiluminescence assay for free radical properties of the smoke. The experimental approaches developed for this study are of general scope and may be used for mechanistic elucidation of the excited‐state generation in chemical systems and environments of an arbitrary complexity.