Table A.1
Rate coefficient of dominant formation and destruction reactions of CH+ adopted in the CLOUDY chemical model.
| Reaction No. (Type) | Reactions | Rate coefficients | Units | References |
|---|---|---|---|---|
| Formation reactions | ||||
| R1 (IN) | C+ + ![Mathematical equation: $\[\mathrm{H}_{2}^{*}\]$](/articles/aa/full_html/2026/05/aa59012-26/aa59012-26-eq15.png) → CH+ + H |
6.0 × 10−11 | cm3s−1 | This work |
| C+ + H2 → CH+ + H | 6.7 × 10−11 exp(−1971/T) | cm3s−1 | This work | |
| R2 (PH) | CH + hν → CH+ + e− | 7.6 × 10−10 exp(−3.67 AV) | s−1 | Heays et al. (2017) (KIDA BR = 46%) |
| CH + hν → C + H | 9.1 × 10−10 exp(−2.12 AV) | s−1 | Heays et al. (2017) (KIDA BR = 54%) | |
| Destruction reactions | ||||
| R3 (DR) | CH+ + e− → C + H | 1.7 × 10−7 (T/300)−0.75 | cm3s−1 | This work |
| R4 (IN) | CH+ + H → C+ + H2 | 1.0 × 10−9 (T/300)−0.45 exp(−12.4/T) | cm3s−1 | This work |
| R5 (IN) | CH+ + H2 → ![Mathematical equation: $\[\mathrm{CH}_{2}^{+}\]$](/articles/aa/full_html/2026/05/aa59012-26/aa59012-26-eq16.png) + H |
1.20 × 10−9 | cm3s−1 | CLOUDY default |
| R6 (PH) | CH+ + hν → C + H+ | 3.3 × 10−10 exp(−3.54 AV) | s−1 | Heays et al. (2017) |
| HeH+ formation reaction | ||||
| R1* (RA) | He+ + H → HeH+ + hν | 2.32 × 10−16 exp(122/T) | cm3s−1 | Paper I |
Notes. IN refers to ion-neutral reactions, PH to photodissociation reactions, DR to dissociative recombination reactions, RA to radiative association reactions, and hν to a photon energy.
(*) The thermal rate coefficient for reaction R1 (He+ + H → HeH+ + hν) corrects a typographical error in Paper I.
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