Table 2
List of nitrogen, as well as carbon+nitrogen, isotopic exchange reactions included in the model.
| Label | Reaction | kf (cm3 s−1) | f (B, m)(a) | ΔE(b) (K) | References |
|---|---|---|---|---|---|
| N isotopic exchange reactions from Roueff et al. (2015). | |||||
| (32) A | N15N + N2H+ ⇌ N15NH+ + N2 | 2.3 × 10−10 | 0.5 | 10.3 | (1), (2) |
| (33) A | N15N + N2H+ ⇌ 15NNH+ + N2 | 2.3 × 10−10 | 0.5 | 2.1 | (1), (2) |
| (34) A | N15N + 15NNH+ ⇌ N15NH+ + N15N | 4.6 10−10 | 1 | 8.1 | (1), (2) |
| (35) B | 15N+ + N2 ⇌ 14N+ + N15N |  |
2 | 28.3 | (1), (3) |
| (36) C | 15N + CNC+ ⇌ C15NC+ + 14N |  |
1 | 38.1 | (1) |
| (37) B |  |
 |
1 | 26.7 | (1) |
| N isotopic exchange reactions from Loison et al. (2019). | |||||
| (38) B |  |
 |
1 | 14.5 | (4) |
| (39) B | HCNH+ + HC15N ⇌HC15NH+ + HCN |  |
1 | 10.1 | (4) |
| Spin-state dependent NH+ formation reactions involving 14N and 15N. | |||||
| (40) | 14N+ + p-H2 → 14NH+ + H | 8.35 × 10−10 × exp(−168.5/T) | – | 168.5 | (1), (5) |
| (41) | 14N+ + o-H2 → 14NH+ + H |  |
– | 44.5 | (1), (5) |
| (42) | 15N+ + p-H2 → 15NH+ + H | 8.35 × 10−10 × exp(−164.3/T) | – | 164.3 | (1) |
| (43) | 15N+ + o-H2 → 15NH+ + H |  |
– | 39.7 | (1) |
| New C+N isotopic exchange reactions proposed here. | |||||
| (44) B | 13C+ + C15N ⇌ C+ + 13C15N |  |
1 | 31.6 | This work, (6) (9) |
| (45) B | 13C + C15N ⇌ C + 13C15N |  |
1 | 31.6 | This work, (6) (9) |
| (46) B | 13C + HC15N ⇌ C + H13C15N |  |
1 | 47.5 | This work, (10) |
| (47) B | 13C + H15NC ⇌ C + H15N13C |  |
1 | 33.8 | This work, (10) |
| (48) B | 13C + HC15NH+ ⇌ C + H13C15NH+ |  |
1 | 50.8 | This work, (10) |
| (49) B | HC15N + H13CNH+ ⇌ H13CN + HC15NH+ |  |
1 | 6.9 | This work, (10) |
| (50) B | H13CN + HC15NH+ ⇌ HCN + H13C15NH+ |  |
1 | 2.4 | This work, (10) |
| (51) B | HC15N + H13CNH+ ⇌ HCN + H13C15NH+ |  |
1 | 10.5 | This work, (10) |
Notes. Type A reactions are direct reactions, type B reactions involve adduct formation without isomerization, and type C reactions involve adduct formation with possible isomerization pathways, as defined by Roueff et al. (2015).(a)f (B, m) is a probability factor that depends on the rotational constant, mass, and symmetry factors of the reactants and products. In reactions involving 13C, the mass ratio of the reactants and the products is close to unity. Then, f(B, m) = q(C)q(D)/q(A)q(B), where A and B are the reactants, C and D the products, and q(…) are the internal molecular partition functions. (b)ΔE is the exoergicity of the exchange reaction in the forward direction.
References. (1) Roueff et al. (2015); (2) Adams & Smith (1981); (3) Anicich et al. (1977); (4) Loison et al. (2019); (5) Dislaire et al. (2012); (6) Ram et al. (2010); (7) Ram & Bernath (2012); (8) Colin & Bernath (2012); (9) Colin & Bernath (2014); (10) Mehnen et al. (2022).
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