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Table 3

List of HCN formation and destruction reactions, to accompany Fig. 9.

Formation reactions

1 H2 exc + CN HCN + H
2 HCN ice + dust HCN + dust
3 H + HCN+ HCN + H+
4 H2 + CN HCN + H
5 HCNH+ + e HCN + H
6 C + NH2 HCN + H
7 HCN ice + γ(ISM) HCN
8 N + CH3 HCN + H2
9 CH + NO HCN + O
10
11 NH3 + CN HCN + NH2
12 N + CH2 HCN + H
13 N + CH3 HCN + H + H
14 HCN ice + p(cosmic) HCN
15 H + CN HCN + e
16 Na + HCNH+ HCN + Na+ + H
17 OH + CN HCN + O
18 CH2 + NO HCN + OH
19 N + HCO HCN + O
Destruction reactions

1 H+ + HCN HCN+ + H
2 HCN + dust HCN ice + dust
3 HCN + γ(ISM) CN + H
4
5 N+ + HCN HCN+ + N
6 H3O+ + HCN HCNH+ + H2O
7 H + HCN CN + H2
8 HCN + HCO + HCNH+ + CO
9
10 He+ + HCN CN+ + He
11 OH+ + HCN HCNH+ + O
12 NH+ + HCN HCNH+ + N
13 CH+ + HCN HCNH+ + C
14 O + HCN CN + OH

Notes. The abbreviations are as follows: (exc) denotes an excited state, γ(ISM) denotes a UV photon, γ(CR) denotes a cosmic ray-induced UV photon, and p(cosmic) denotes a cosmic ray proton. We note that some of the literature which uses UMIST reactions denotes the latter three as PHOTON, CRPHOT, and CRP respectively.

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