Table 1
Carbon isotopic exchange reactions used in this work.
| Label | Reaction | kf | f(B, m)(a) | ΔE(b) |
|---|---|---|---|---|
| (cm3 s−1) | (K) | |||
| (1) B | 13C+ + CO ⇌12C+ + 13CO | 6.6 × 10 |
1 | 34.7 |
 |
||||
| (2) A | 13CO + HCO+ ⇌ CO + H13CO+ | 2.6 × 10 |
1 | 17.4 |
| (3) B | 13C+ + CN ⇌12C+ + 13CN | 3.82 × 10−9× | 1 | 31.1 |
 |
||||
| (4) B | 13C + CN ⇌12C + 13CN | 3.0 × 10 |
1 | 31.1 |
| (5) B | 13C + C2 ⇌12C + 13CC | 3.0 × 10 |
2 | 25.9 |
| (6) B | 13C+ + C2 ⇌12C+ + 13CC | 1.86 × 10 |
2 | 25.9 |
| (7) B | 13C+ + 13CC ⇌12C+ + 13C2 | 1.86 × 10 |
0.5 | 26.4 |
| (8) B | 13C + 13CC ⇌12C + 13C2 | 3.0 × 10 |
0.5 | 26.4 |
| (9) B | 13C+ + CS ⇌12C+ + 13CS | 1.86 × 10 |
1 | 26.3 |
| (10) B | 13C + C3 ⇌12C + 13CC2 | 3.0 × 10 |
2 | 27 |
| (11) B | 13C+ + C3 ⇌12C+ + 13CC2 | 9.5 × 10 |
2 | 27 |
Notes. The top panel displays the reactions already used by Roueff et al. (2015), while the bottom panel displays thereactions added for the present study. Type A reactions are direct reactions, while type B reactions are those involving adduct formation, without isomerisation, 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 reaction.
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