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Rate constant and products of the reaction of O( 3 P) atoms with thiirane over the temperature range 220–950 K
Author(s) -
Bedjanian Yuri
Publication year - 2022
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.21594
Subject(s) - chemistry , atmospheric temperature range , reaction rate constant , radical , analytical chemistry (journal) , branching fraction , branching (polymer chemistry) , thiirane , oxygen , negative temperature , molecule , mass spectrometry , range (aeronautics) , atomic physics , kinetics , thermodynamics , organic chemistry , ring (chemistry) , physics , materials science , quantum mechanics , composite material , chromatography
A discharge‐flow modulated molecular beam mass spectrometry technique has been used to determine the rate constant for the reaction of ground state oxygen atoms with C 2 H 4 S in the temperature range 220–950 K. The reaction rate constant has been determined directly by monitoring C 2 H 4 S in an excess of O atoms and through competitive reaction of oxygen atoms with C 2 H 4 S and Br 2 . Weak, negative temperature dependence is observed below 300 K, whereas positive temperature dependence is observed above 380 K: k = 1.13 × 10 –12 ( T /298) 2.18 exp(733/ T ) cm 3 molecule –1 s –1 . We estimate this expression to be accurate within 15% over the investigated temperature range. SO and C 2 H 4 have been detected as reaction products and a branching ratio of unity (with uncertainty of 10%) has been found for the channel forming these two species in the temperature range 300–900 K, confirming that the title reaction is an efficient source of SO radicals.