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Table 4
Most important reactions to H2S in the model.
| Visual extinction | TMC 1 | |
|---|---|---|
| Minissale bare | Minissale ice | |
| H2S production | ||
| Av ~ 5 mag | s-H + s-HS → H2S (91.0%) | s-H + s-HS → H2S (90.3%) |
| H3CS+ + e−→ H2S + CH (8.2%) | H3CS+ + e−→ H2S + CH (9.2%) | |
| Av ~ 20 mag | s-H + s-HS → H2S (55.1%) | s-H + s-HS → H2S (43.6%) |
| H3S+ + e−→ H + H2S (31.9%) | H3S+ + e−→ H + H2S (43.3%) | |
| H2S destruction | ||
| Av ~ 5 mag | H2S + S+ → H2 + S (40.1%) |
H2S + S+ → H2 + S (39.1%) |
| C + H2S → HCS + H (16.7%) | C + H2S → HCS + H (18.0%) | |
| Av ~ 20 mag | H2S + H H2 + H3S+(†) (51.7%) |
H2S + H H2 + H3S+ (72.9%) |
H2S + S+ → H2 + S (11.2%) |
H2S + H+ → H + H2S+ (6.4%) | |
| Visual extinction | Barnard 1b | |
| Minissale bare | Minissale ice | |
| H2S production | ||
| Av ~ 5 mag | s-H + s-HS → H2S (99.2%) | s-H + s-HS → H2S (85.4%) |
| S + H2S+ → H2S + S+ (0.3%) | s-H2S → H2S (0.3%) | |
| Av ~ 70 mag | H3S+ + e−→ H + H2S (48.4%) | H3S+ + e−→ H + H2S (47.0%) |
| s-H + s-HS → H2S (42.8%) | s-H + s-HS → H2S (46.8%) | |
| H2S destruction | ||
| Av ~ 5 mag | H2S + S+ → H2 + S (39.2%) |
H2S + S+ → H2 + S (38.0%) |
| C + H2S → HCS + H (32.1%) | C + H2S → HCS + H (32.4%) | |
| Av ~ 70 mag | H2S + H H2 + H3S+ (73.8%) |
H2S + H H2 + H3S+ (69.8%) |
| H2S + H+ → H + H2S+ (10.9%) | H2S + H+ → H + H2S+ (20.6%) | |
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