Open Access
Table 1
Control parameters.
| Parameter | Unit | Range | Description |
|---|---|---|---|
| nH | cm−3 | 103−107 | Hydrogen nucleus number density |
| ζ | 10−17 s−1 | 1–300 | Hydrogen cosmic-ray ionization rate |
| T | K | 5–20 | Gas temperature |
| δC | – | 10−5−10−4 | Carbon gas-phase abundance |
| δN | – | 10−5−10−4 | Nitrogen gas-phase abundance |
| δO | – | 10−5−10−4 | Oxygen gas-phase abundance |
| δS | – | 8 × 10−8 | Sulfur gas-phase abundance |
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