Table 4
Reaction network used to calculate the HCO+ abundance given values for H, H2, and CO.
| No. | Reaction (a) | a | b |
|---|---|---|---|
| 1. | H2 + CR → H + e− |
... (b) | ... |
| 2. | H + H2 → H + H |
2 × 10−9 | 0 |
| 3. | H + N2 → N2H+ + H2 |
1.70 × 10−9 | 0 |
| 4. | H + CO → HCO+ + H2 |
1.61 × 10−9 | 0 |
| 5. | N2H+ + CO → HCO+ + N2 | 8.8 × 10−10 | 0 |
| 6. | HCO+ + e− → H + CO | 2.8 × 10−7 | –0.69 |
| 7. | N2H+ + e− → NH + N | 1.3 × 10−8 | –0.84 |
| 8. | N2H+ + e− → N2 + H | 2.47 × 10−7 | –0.84 |
| 9. | H + e− → H2 + H |
2.34 × 10−8 | –0.52 |
| 10. | H + e− → H + H + H |
4.36 × 10−8 | –0.52 |
Notes. Reactions with a cosmic ray (CR) is also included. Reaction rate coefficients are obtained from the Kinetic Database for Astrochemistry (KiDA, Wakelam et al. 2012). (a) The reaction rate coefficient is given by 
cm3 s−1. These reaction rates are valid up to 300 K. (b)See text for the CR ionization rate.
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