Table 2
Reaction coefficients of the reactions used in this paper.
| Reaction | α | β | γ | k(100 K) | k(150 K) | Units | Ref. | NW | W | |
|---|---|---|---|---|---|---|---|---|---|---|
| ζcr |  |
1(−17) | 0 | 0 | 1(−17) | 1(−17) | s-1 | ✓ | ✓ | |
| k2 |  |
2.1(−9) | 0 | 0 | 2.1(−9) | 2.1(−9) | cm3 s-1 | (a) | ✓ | ✓ |
| k3 |  |
2.3(−8) | − 0.5 | 0 | 4.1(−8) | 3.4(−8) | cm3 s-1 | (b) | ✓ | ✓ |
| k4 |  |
1.4(−9) | − 0.1 | − 3.4 | 1.6(−9) | 1.5(−9) | cm3 s-1 | (c) | ✓ | ✓ |
 |
HCO+ + e-→ CO + H | 2.4(−7) | − 0.7 | 0 | 5.1(−7) | 3.9(−7) | cm3 s-1 | (d) | ✓ | ✓ |
 |
HCO+ + H2O → CO + H3O+ | 2.5(−9) | − 0.5 | 0 | 4.3(−9) | 3.5(−9) | cm3 s-1 | (e) | ✓ | |
| k7 | H3O+ + e-→ H2O + H | 7.1(−8) | − 0.5 | 0 | 1.2(−7) | 1.0(−7) | cm3 s-1 | (f) | ✓ | |
| k8 |  |
5.9(−9) | − 0.5 | 0 | 1.0(−8) | 8.3(−9) | cm3 s-1 | (g, h) | ✓ | |
| kf | H2O → H2O (ice) |  |
0.5 | 0 |  |
 |
s-1 | (i) | ✓ | |
| kd | H2O (ice) → H2O | 2.8(12) | 0 | 5.8(3) | 2.4(−13) | 5.4(−5) | s-1 | (i) | ✓ |
Notes. The last two columns indicate in which chemical networks the reactions are used. a(b) represents a × 10b. NW is the chemical network without water, whereas W includes water. All reactions are given in the form 
, where the values of α, β, and γ for k2, k3, k4, 
, 
, k7, and k8 are taken from the rate12 UMIST database (McElroy et al. 2013) and kd uses Tdust instead of Tgas.
References.(a) Theard & Huntress (1974), (b) McCall et al. (2004), (c) Klippenstein et al. (2010), (d) Mitchell (1990), (e) Adams et al. (1978), (f) Novotný et al. (2010), (g) Kim et al. (1974), (h) Anicich et al. (1975), and (i) Appendix A and references therein.
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