Table 1
List of carbon isotopic exchange reactions included in the model.
| Label | Reaction | kf (cm3 s−1) | f (B, m)(a) | ΔE(b) (K) | References |
|---|---|---|---|---|---|
| C isotopic exchange reactions included in Colzi et al. (2020). | |||||
| (1) B | 13C+ + CO ⇌ 12C+ + 13CO |  |
1 | 34.7 | (1) |
| (2) A | 13CO + HCO+ ⇌ CO + H13CO+ |  |
1 | 17.4 | (1) |
| (3) B | 13C+ + CN ⇌ 12C+ + 13CN |  |
1 | 31.1 | (1) |
| (4) B | 13C + CN ⇌ 12C + 13CN |  |
1 | 31.1 | (1) |
| (5) B | 13C + C2 ⇌ 12C + 13CC |  |
2 | 25.9 | (1) |
| (6) B | 13C+ + C2 ⇌ 12C+ + 13CC |  |
2 | 25.9 | (2) |
| (7) B | 13C+ + 13CC ⇌ 12C+ + 13C2 |  |
0.5 | 26.4 | (2) |
| (8) B | 13C + 13CC ⇌ 12C + 13C2 |  |
0.5 | 26.4 | (2) |
| (9) B | 13C+ +CS ⇌ 12C+ + 13CS |  |
1 | 26.3 | (2) |
| (10) B | 13C + C3 ⇌ 12C + 13CC2 |  |
2 | 27 | (2) |
| (11) B | 13C+ + C3 ⇌ 12C+ + 13CC2 |  |
2 | 27 | (2) |
| Newly included C isotopic exchange reactions. See also Loison et al. (2020). | |||||
| (12) B | 12C+ + 13CCC ⇌ 12C+ + C13CC |  |
0.5 | 16 | (2), (3) |
| (13) B | 13C+ + C3 ⇌ 12C+ +C13CC |  |
1 | 43 | This work |
| (14) B | 12C + 13CCC ⇌ 12C + C13CC |  |
0.5 | 16 | (2), (3) |
| (15) B | 13C + C3 ⇌ 12C + C13CC |  |
1 | 43 | This work |
| (16) B | 13C + 13CC2 ⇌ 12C + C13C2 |  |
1 | 43 | This work. See also (3) |
| (17) B | 13C + 13CC2 ⇌ 12C + 13CC13C |  |
0.5 | 27 | This work. See also (3) |
| (18) B | 13C + C13CC ⇌ 12C + C13C2 |  |
2 | 27 | This work. See also (3) |
| (19) B | 13C + C13CC ⇌ 12C + 13CC13C |  |
1 | 11 | This work. See also (3) |
| (20) B | 13C+ + 13CC2 ⇌ 12C+ + C13C2 |  |
1 | 43 | This work. See also (3) |
| (21) B | 13C+ + 13CC2 ⇌ 12C+ + 13CC13C |  |
0.5 | 27 | This work. See also (3) |
| (22) B | 13C+ + C13CC ⇌ 12C+ + C13C2 |  |
2 | 27 | This work. See also (3) |
| (23) B | 13C+ + C13CC ⇌ 12C+ + 13CC13C |  |
1 | 11 | This work. See also (3) |
| (24) B | 13C + HCN ⇌ 12C + H13CN |  |
1 | 48 | (3) |
| (25) B | 13C + HNC ⇌ 12C + HN13C |  |
1 | 33 | (3) |
| (26) B | 13C + HCNH+ ⇌ 12C + H13CNH+ |  |
1 | 50 | (3) |
| (27) B | 13C + CS ⇌ 12C + 13CS |  |
1 | 26.3 | (3) |
| (28) B | H+ 13CCH ⇌ H+C13CH |  |
1 | 8.1 | (3) |
| (29-a) B | H+ c-13CCCH2 ⇌ H+ c-C13CCH2 |  |
2 | 26 | (3) |
| (29-b) B | H+ c-13CCCH2 ⇌ H+ c-CC13CH2 |  |
2 | 26 | (3) |
| (30) B | H+ 13CCS ⇌ H+C13CS |  |
1 | 18 | (3) |
| (31) B | HCNH+ + H13CN ⇌ H13CNH+ + HCN |  |
1 | 2.9 | (3) |
Notes. Type A reactions are direct reactions, while type B reactions are those involving adduct formation, without isomerization, 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) Colzi et al. (2020); (3) Loison et al. (2020).
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