Premium
Rate constants for the reaction of SO with NO 2 over the temperature range 220–960 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.21578
Subject(s) - chemistry , torr , reaction rate constant , radical , atmospheric temperature range , analytical chemistry (journal) , quadrupole mass analyzer , helium , range (aeronautics) , mass spectrometry , combustion , quadrupole , ionization , kinetics , atomic physics , thermodynamics , organic chemistry , ion , physics , materials science , chromatography , quantum mechanics , composite material
The kinetics of the reaction of SO radicals with NO 2 have been studied in a discharge flow reactor combined with an electron impact ionization quadrupole mass spectrometer at nearly 2 Torr total pressure of helium and in the temperature range 220–960 K. The reaction rate constant was determined under pseudo‐first order conditions in excess of NO 2 over SO using two different methods for generation of the SO radicals: k 1 = (6.7 ± 0.2) × 10 −12 exp(295 ± 10)/ T ) cm 3 molecule −1 s −1 (the uncertainties represent precision at the 2σ level, the estimated total uncertainty on the rate constant being 15% at all temperatures). The present measurements indicate that the current recommendations for k 1 underestimate the rate constant at low stratospheric temperatures and overestimate it at the high temperatures characteristic of combustion.