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Table D.1
Conditions in diffuse cloud models and coefficients for departure from LTE of the population in the CH N = 1, J = 1∕2 HFS.
| Model 1 | Model 2 | |
|---|---|---|
| diffuse molecular | translucent | |
| χ [Habing] | 1.7 | 1.7 |
| AV | 0.2 | 1 |
| nH [cm−3] | 100 | 1000 |
 |
0.1 | 0.5 |
| Tgas [K] | 100 | 15 |
| Tdust[K] | 16 | 12 |
| ΔυFWHM [km s−1] | 3.3 | 3.3 |
| N(CH) [1013 cm−2] | 1.75 | 1.58 |
| LTE departure coefficients | ||
| F = 0+ | 3.702 | 0.5480 |
| F = 1+ | 3.721 | 0.5492 |
| F = 0− | 6.875 | 2.178 |
| F = 1− | 6.948 | 2.199 |
| Fractional population (per sub-level) in ground state | ||
| F = 0+ | 0.0870 | 0.0504 |
| F = 1+ | 0.0875 | 0.0505 |
| F = 0− | 0.1613 | 0.1981 |
| F = 1− | 0.1630 | 0.2000 |
| Fractional population in excited states [ppm] | ||
| 100 | 200 | |
Notes. Departure coefficients are defined as the fractional level population with respect to LTE. The FUV field is parametrized in units of the Habing field (Draine field = 1.7 Habing, Draine 1978).
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