Open Access
Table 2
Main chemical reactions involving 
in the interstellar medium (taken from KIDA, Wakelam et al. 2012).
| Type | Reactions | k(T) (cm3 s−1) | Label | ||
|---|---|---|---|---|---|
| Dissociative recombination |  |
→ | C2H + H + H | k1(100K) = 7.4 × 10−7 | 1 |
| → | C2H2 + H | k2(100K) = 3.6 × 10−7 | 2 | ||
| Destruction by H atom |  |
→ |  |
k3 = 6.8 × 10−11 | 3 |
| Protonation of acetylene |  |
→ |  |
k4 = 3.5 × 10−9 | 4 |
| C2H2 + HCO+ | → |  |
k5 = 1.4 × 10−9 | 5 | |
| C2H2 + N2H+ | → |  |
k6 = 1.4 × 10−9 | 6 | |
| Production from methane | CH4 + C+ | → |  |
k7 = 1.0 × 10−9 | 7 |
| CH4 + CH+ | → |  |
k8 = 1.1 × 10−9 | 8 | |
 |
→ |  |
k9(100K) = 2.3 × 10−9 | 9 | |
Hydrogenation of  |
 |
→ |  |
k10 ≲ 3 × 10−12 at T ≤ 300 K | 10 |
| Top-down chemistry e.g.: |  |
→ |  |
k11 = 4.5 × 10−11 | 11 |
| PAH photo-degradation | PAH + γ | → |  |
– | 12 |
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