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Table 2
Reaction channels and rate coefficients.
| Reaction | Rate coefficient (cm3 s−1) | |
|---|---|---|
| Charge transfer: | ||
| H+ + O →O+ + H | k1 |  |
| O+ + H →H+ + O | k2 |  |
| Ion-molecule reaction: | ||
| O+ + H2 →OH+ + H | k3 | 1.7 × 10−9 |
| OH+ + H2 →H2O+ + H | k4 | 1.0 × 10−9 |
| H+ and PAH(−) recombination: | ||
| H+ + PAH →PAH+ + H | α | 7.0 × 10−8ΦPAH |
| H+ + PAH−→PAH + H | α− |  |
| Radiative recombination: | ||
| H+ + e−→H + hν |  |
 |
| Dissociative recombination: | ||
| OH+ + e−→O + H |  |
 |
| Cosmic ray ionization: | ||
| H + CR →H+ + e− | ζH | ≡ 1.5ζp (s−1)b |
Notes. Rate coefficients are based on Hollenbach et al. (2012) and references therein. References.(a)Chambaud et al. (1980). (b)Glassgold & Langer (1974).
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