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Temperature dependent CH 3 OCl formation in the reaction between CH 3 O 2 and ClO
Author(s) -
Helleis Frank,
Crowley John,
Moortgat Geert
Publication year - 1994
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/94gl01280
Subject(s) - reaction rate constant , chemistry , branching (polymer chemistry) , analytical chemistry (journal) , physics , kinetics , organic chemistry , quantum mechanics
The reaction CH 3 O 2 + ClO → CH 3 OCl + O 2 (2b) has been investigated at temperatures of 295, 255, 230 and 215 K. The temperature dependent branching ratio for CH 3 OCl formation (α 2b ) is given by α 2b = (T/300) −1.65 −0.223exp(411/T). The result at 200 K ( ca 0.23) can be combined with our previous determination of the overall rate constant for the reaction between CH 3 O 2 + ClO [ Helleis et al, 1993] to calculate a channel specific rate constant for reaction 2b of ca (4.1±1) × 10 −13 cm³ molecule −1 s −1 at the temperatures prevalent in the lower polar stratosphere at springtime.