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Rate constant of OH + OCS reaction over the temperature range 255–483 K
Author(s) -
Cheng BingMing,
Lee YuanPern
Publication year - 1986
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/kin.550181202
Subject(s) - chemistry , arrhenius equation , reaction rate constant , atmospheric temperature range , analytical chemistry (journal) , impurity , helium , resonance fluorescence , molecule , range (aeronautics) , fluorescence , thermodynamics , activation energy , kinetics , chromatography , organic chemistry , physics , materials science , quantum mechanics , composite material
The rate constant of the reaction between OH and OCS in helium over the temperature range 255–483 K has been determined using the discharge flow‐resonance fluorescence technique. The OCS has been carefully purified to avoid interference from H 2 S and CO impurities. An FTIR with a multireflection cell was used to determine the impurity concentrations and the purified sample was found to contain less than 0.005% of H 2 S. At 300 K, the rate constant was determined to be (2.0 ± 0.4 0.8 ) × 10 −15 cm 3 molecule −1 s −1 . Although the rate constants showed slight positive deviation at lower temperatures, thev can be satisfactorily fitted by the Arrhenius equation, k = 1.13 × 10 −13 exp(−1200/ T ) cm 3 molecule −1 s −1 . No pressure dependence was observed at all temperatures, nor was O 2 enhancement observed under our experimental conditions.