Table 2
Reaction rates of the formation and destruction processes of H+, PAH, PAH0, and PAH+ included in the simulations.
| Reaction | Rate | Unit | Reference |
|---|---|---|---|
| H + CR → H+ | 2.0 × 10−16 | s−1 | Wolfire et al. (2003) total ionization rate(a) |
| H+ + PAH− → H + PAH0 | 8.3 × 10−07 (T/100K)−0.5 | cm3 s−1 | Draine & Sutin (1987)(b) |
| H+ + PAH0 → H + PAH+ | 3.1 × 10−08 | cm3 s−1 | Draine & Sutin (1987)(b) |
| PAH− + γ → PAH0 + e− | 1.8 × 10−08 exp(−2.5AV) | s−1 | Weingartner & Draine (2001)(b,c) |
| PAH0 + γ → PAH+ + e− | 1.2 × 10−08 exp(−2.5AV) | s−1 | Weingartner & Draine (2001)(b,c) |
| PAH0 + e− → PAH− | 1.3 × 10−06 | cm3 s−1 | Draine & Sutin (1987)(b,d) |
| PAH+ + e− → PAH0 | 3.5 × 10−05 (T/100K)−0.5 | cm3 s−1 | Draine & Sutin (1987)(b,d) |
Notes. (a) This rate includes the ionization induced by EUV photons, X-rays, and cosmic rays. (b) Rates computed for a spherical PAH with a radius of 5 Å. (c) The dependence on the visual extinction AV is set to match the dependence on AV of the photoelectric effect adopted in Eq. (11) of Paper I. (d) Assuming a sticking coefficient of electrons onto PAHs, se = 1.
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