Table 2
Reactions with recently calculated low-temperature rate constants.
| No. | Reaction | Ref. | Tthresh | UMIST2012 Values | Tl | Low-temperature fit | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| (K) | α | β | γ | (K) | α | β | γ | |||
| 1 | H2 + OH → H2O + H | M16 | 200 | 2.05(−12) | 1.52 | 1736 | 250 | 2.342(−15) | 5.2729 | 0.072 |
| 2 | CH4 + OH → CH3 + H2O | L17 | 240 | 3.77(−13) | 2.42 | 1162 | 178 | 8.252(−14) | 7.753 | 0.040 |
| 3 | CH4 + H → CH3 + H2 | B16 | 300 | 5.94(−13) | 3.0 | 4045 | 300 | 1.19(−19) | 16.37 | 1.217 |
| Literature search after screening | ||||||||||
| 24 | H2 + CN → HCN + H | J06 | 200 | 4.04(−13) | 2.87 | 820 | 200 | 1.826(−13) | 11.920 | 6.3(-4) |
| 26 | H2 + O → H + OH | B03 | 450 | 3.14(−13) | 2.70 | 3150 | 298 | 5.79(−16) | 7.077 | 1340 |
| 41 | CH4 + O → OH + CH3 | Z16 | 500 | 2.29(−12) | 2.20 | 3820 | 298 | 7.132(−15) | 5.200 | 1560 |
Notes. The table lists: their references (including the lower boundary of the recommended temperature range of the UMIST2012 database, Tl), their threshold temperature Tthresh, and their respective Arrhenius fit parameters for the low-temperature regime below Tthresh. The notation x(−y) stands for x × 10−y.
References. M16 (Meisner & Kästner 2016b), L17 (Lamberts et al. 2017), B16 (Beyer et al. 2016), J06 (Ju et al. 2006), B03 (Balakrishnan 2003), Z16 (Zhao et al. 2016).
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