Table 1
Type, number, and reaction rates of all reactions in the chemical network of the CSE model.
| Reaction type | Num | Reaction rate | ||
|---|---|---|---|---|
| Associative Detachment (AD) | 136 |  |
||
| Collisional Dissociation (CD) | 44 | k1 | ||
| Charge Exchange (CE) | 1536 | k1 | ||
| Dissociative Recombination (DR) | 1273 | k1 | ||
| Ion-Neutral (IN) | 8737 | k1 | ||
| Mutual Neutralisation (MN) | 39 | k1 | ||
| Neutral-Neutral (NN) | 1986 | k1 | ||
| Radiative Association (RA) | 294 | k1 | ||
| Radiative Electron Attachment (REA) | 8 | k1 | ||
| Radiative Recombination (RR) | 28 | k1 | ||
| Cosmic-ray Proton (CP) | 16 | k2 = α(s−1) | ||
| Cosmic-ray Photon (CR) | 443 |  |
||
| Photo Process (PH) | 568 | k4 = αexp(−γAV) (s−1) |
Notes. Reaction rates applicable to different reaction types follow the analytical prescriptions k1, k2, k3, k4. In all of these, T is the gas temperature; the other parameters are defined as follows: k1: α is the pre-exponential factor, β indicates the temperature dependence of the rate coefficient and γ is the activation energy of the reaction; k2: α is the cosmic-ray ionisation rate; k3: α is the cosmic-ray ionisation rate, γ is the probability per cosmic-ray ionisation that the photo-reaction takes place and ω is the dust-grain albedo; k4: α is the photodissociation rate in the unshielded region, AV is the extinction by the interstellar dust at visible wavelength and γ is a parameter to take into account the increased extinction at ultra-violet wavelengths compared to the visible.
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