Table B.2
Kinetic loss rates used in Section 4.1.
| Reactants | Products | Kinetic rate (cm3 s−1) | Uncertainties | References | |||
|---|---|---|---|---|---|---|---|
| H2O++ H2O | → | H3O+ | +HO | 1.85 × 10−9  |
± 15% | Anicich (1993) | |
CO + H2O |
→ | H2O+ | +CO2 | } | 2.40 × 10−9  |
± 15% | " |
HCO |
+HO | ||||||
CH + H2O |
→ | H3O+ | +CH3 | 2.50 × 10−9  |
± 10% | ||
CH + H2O |
→ | CH3OH |
+hν | 4.61 × 10−13  * |
± 100% | Bates (1983); Herbst (1985) | |
CH + H2O |
→ | H2COH+ | +H | 2.05 × 10−9  |
± 60% | Anicich (1993) | |
| CH+ + H2O | → | HCO+ | +H2O | } | 2.90 × 10−9  |
± 20% | " |
| H3O+ | +C | ||||||
| H2CO+ | +H | ||||||
NH +H2O |
→ | NH |
+HO | 2.50 × 10−10  |
± 30% | " | |
NH + H2O |
→ | H3O+ | +NH | } | 2.90 × 10−9  |
± 20% | " |
NH |
+O | ||||||
NH |
+HO | ||||||
| NH+ + H2O | → | HNO+ | +H2 | } | 3.50 × 10−9  |
± 20% | " |
| H3O+ | +N | ||||||
| H2O+ | +NH | ||||||
NH |
+O | ||||||
NH |
+HO | ||||||
| N+ + H2O | → | H3O+ | +N | 2.70 × 10−9  |
± 20% | " | |
Notes. Most of the rates are experimentally determined at 300 K. A modified Arrhenius law, with a T−1∕2 coefficient, has been employed for all except one which is a radiative association (*). In addition, for the latter which is theoretical, no uncertainties were provided so that we assumed ± 100%. However, Luca et al. (2002) showed that this kinetic rate is most likely overestimated by almost one order of magnitude. Finally, different but theoretical kinetic rates are available in the literature (e.g. Woon & Herbst 2009).
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