Table 1.
Reported bimolecular rate coefficients k and effective first-order rate coefficients (keff = k[Coreactant]) for simple CI reactions with H2O, (H2O)2, and SO2 at a given atmospheric condition
| CI | Coreactant | [Coreactant]/cm−3 | k/cm3s−1 | keff/s−1 | Reference |
| CH2OO | H2O | 5.4 × 1017 | <1.5 × 10−15 | <810 | (22) |
| (H2O)2 | 6.0 × 1014 | 6.5 × 10−12 | 3,900 | (22) | |
| SO2 | 1.2 × 1012 | 3.9 × 10−11 | 47 | (2) | |
| anti-CH3CHOO | H2O | 5.4 × 1017 | 1.0 × 10−14 | 5,400 | (3) |
| 2.4 × 10−14 | 13,000 | (24) | |||
| SO2 | 1.2 × 1012 | 6.7 × 10−11 | 80 | (3) | |
| 2.2 × 10−10 | 260 | (24) | |||
| syn-CH3CHOO | H2O | 5.4 × 1017 | <4 × 10−15 | <2,200 | (3) |
| <2 × 10−16 | <110 | (24) | |||
| SO2 | 1.2 × 1012 | 2.4 × 10−11 | 29 | (3) | |
| 2.9 × 10−11 | 35 | (24) | |||
| (CH3)2COO | H2O | 5.4 × 1017 | <1.5 × 10−16* | <81* | This work |
| (H2O)2 | 6.0 × 1014 | <1.3 × 10−13* | <78* | This work | |
| SO2 | 1.2 × 1012 | 1.3 × 10−10 | 160 | This work |
The assumed concentrations of H2O and SO2 correspond to a relative humidity RH = 70% and a SO2 mixing ratio of 50 ppb at 298 K and 1 atm. Only data from direct kinetic measurements are selected.
*
The rate constant of the H2O reaction with (CH3)2COO is obtained by assuming the rate constant of the (H2O)2 reaction with (CH3)2COO is zero and vice versa (SI Appendix, Table S2); thus, these two effective decay rates should not be added together.