Kinetics of CH2OO reactions with SO2, NO2, NO, H2O and CH3CHO as a function of pressure
Stone, D; Blitz, M; Daubney, L; Howes, NU; Seakins, P
HERO ID
2232185
Reference Type
Journal Article
Year
2014
Language
English
PMID
| HERO ID | 2232185 |
|---|---|
| In Press | No |
| Year | 2014 |
| Title | Kinetics of CH2OO reactions with SO2, NO2, NO, H2O and CH3CHO as a function of pressure |
| Authors | Stone, D; Blitz, M; Daubney, L; Howes, NU; Seakins, P |
| Journal | Physical Chemistry Chemical Physics |
| Volume | 16 |
| Issue | 3 |
| Page Numbers | 1139-1149 |
| Abstract | Kinetics of CH2OO Criegee intermediate reactions with SO2, NO2, NO, H2O and CH3CHO and CH2I radical reactions with NO2 are reported as a function of pressure at 295 K. Measurements were made under pseudo-first-order conditions using flash photolysis of CH2I2-O2-N2 gas mixtures in the presence of excess co-reagent combined with monitoring of HCHO reaction products by laser-induced fluorescence (LIF) spectroscopy and, for the reaction with SO2, direct detection of CH2OO by photoionisation mass spectrometry (PIMS). Rate coefficients for CH2OO + SO2 and CH2OO + NO2 are independent of pressure in the ranges studied and are (3.42 ± 0.42) × 10(-11) cm(3) s(-1) (measured between 1.5 and 450 Torr) and (1.5 ± 0.5) × 10(-12) cm(3) s(-1) (measured between 25 and 300 Torr), respectively. The rate coefficient for CH2OO + CH3CHO is pressure dependent, with the yield of HCHO decreasing with increasing pressure. Upper limits of 2 × 10(-13) cm(3) s(-1) and 9 × 10(-17) cm(3) s(-1) are placed on the rate coefficients for CH2OO + NO and CH2OO + H2O, respectively. The upper limit for the rate coefficient for CH2OO + H2O is significantly lower than has been reported previously, with consequences for modelling of atmospheric impacts of CH2OO chemistry. |
| Doi | 10.1039/c3cp54391a |
| Pmid | 24287566 |
| Wosid | WOS:000328643900038 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Language Text | English |