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A kinetic study of the atmospheric photolysis of α‐dicarbonyls
Author(s) -
Klotz Björn,
Graedler Florian,
Sørensen Søren,
Barnes Ian,
Becker KarlHeinz
Publication year - 2000
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/1097-4601(20010101)33:1<9::aid-kin2>3.0.co;2-v
Subject(s) - glyoxal , photodissociation , chemistry , photochemistry , troposphere , atmospheric chemistry , analytical chemistry (journal) , organic chemistry , meteorology , ozone , physics
Photolysis frequencies of biacetyl, methyl glyoxal, and glyoxal have been determined relative to the photolysis frequency of NO 2 . The values were measured under natural sunlight conditions in a large‐volume outdoor reaction chamber. The experimental results obtained are compared to photolysis frequencies used in current models of tropospheric photo‐oxidant formation. For biacetyl, a ratio of J(biacetyl)/J(NO 2 ) = (0.0364 ± 0.0026) was found, in good agreement with previous measurements and models. For methyl glyoxal, however, the experimental photolysis frequency ratios were significantly larger than those calculated from models. This could only partly be explained by reaction of methyl glyoxal with HO 2 . Due to this inconsistency, it is preferred not to cite a ratio for J(methyl glyoxal)/J(NO 2 ). The agreement between calculated and experimental photolysis frequency ratios of glyoxal was reasonably good, a ratio of J(glyoxal)/J(NO 2 ) = 0.0109 has been found, with estimated overall error margins of about 30%. © 2000 John Wiley & Sons, Inc. Int J Chem Kinet 33: 9–20, 2001