Table E.1.
Reactions involving S-bearing species not included in either the chemical network UMIST RATE12 or that of Vidal et al. (2017).
| Reaction | α (cm3 s−1) | β | γ (K) | Type | Reference |
|---|---|---|---|---|---|
| NCS chemistry | |||||
| CN + S2 → NCS + S | 2.02 × 10−11 | −0.19 | −31.9 | 1 | (CN + O2) |
| CN + SO → NCS + O | 2.02 × 10−11 | −0.19 | −31.9 | 1 | (CN + O2) |
| N + HCS → NCS + H | 1.00 × 10−10 | 0.00 | 0 | 1 | (N + HCO) |
| O + NCS → CO + NS | 1.00 × 10−10 | 0.00 | 0 | 1 | (O + OCN) |
| H + NCS → SH + CN | 1.00 × 10−10 | 0.00 | 0 | 1 | (H + OCN) |
| C + NCS → CS + CN | 1.00 × 10−10 | 0.00 | 0 | 1 | (C + OCN) |
 + NCS → HNCS+ + H2 |
0.50 | 3.47 × 10−9 | 2.92 | 2 | ( + HNCS) |
 + NCS → HSCN+ + H2 |
0.50 | 3.47 × 10−9 | 2.92 | 2 | ( + HNCS) |
| HCO+ + NCS → HNCS+ + CO | 0.50 | 1.32 × 10−9 | 2.92 | 2 | (HCO+ + HNCS) |
| HCO+ + NCS → HSCN+ + CO | 0.50 | 1.32 × 10−9 | 2.92 | 2 | (HCO+ + HNCS) |
| HNCS+ + H2 → H2NCS+ + H | 1.51 × 10−9 | 0.00 | 0 | 1 | (HNCO+ + H2) |
| HNCS+ + H2 → HNCSH+ + H | 1.51 × 10−9 | 0.00 | 0 | 1 | (HNCO+ + H2) |
| HSCN+ + H2 → H2SCN+ + H | 1.51 × 10−9 | 0.00 | 0 | 1 | (HOCN+ + H2) |
| HSCN+ + H2 → HNCSH+ + H | 1.51 × 10−9 | 0.00 | 0 | 1 | (HOCN+ + H2) |
| C5S chemistry | |||||
| HC5S+ + e− → C5S + H | 1.00 × 10−7 | −0.50 | 0 | 1 | (HC3S+ + e−) |
| HC5S+ + e− → C4H + CS | 1.00 × 10−7 | −0.50 | 0 | 1 | (HC3S+ + e−) |
| HC5S+ + e− → C4S + CH | 1.00 × 10−7 | −0.50 | 0 | 1 | (HC3S+ + e−) |
| C4H + CS → C5S + H | 2.00 × 10−10 | 0.00 | 0 | 1 | (C2H + CS) |
| S + C5H → CS + C4H | 7.00 × 10−11 | 0.00 | 0 | 1 | (S + C3H) |
| S + C5H → C5S + H | 3.00 × 10−11 | 0.00 | 0 | 1 | (S + C3H) |
| C + C5S → C5 + CS | 3.00 × 10−10 | 0.00 | 0 | 1 | (C + C3S) |
 + C5S → HC5S+ + H2 |
1.00 | 4.29 × 10−9 | 4.39 | 2 | ( + C3S) |
| H3O+ + C5S → HC5S+ + H2O | 1.00 | 1.88 × 10−9 | 4.39 | 2 | (H3O+ + C3S) |
| HCO+ + C5S → HC5S+ + CO | 1.00 | 1.61 × 10−9 | 4.39 | 2 | (HCO+ + C3S) |
| C+ + C5S → C5S+ + C | 0.25 | 2.28 × 10−9 | 4.39 | 2 | (C+ + C3S) |
| C+ + C5S → C6+ + S | 0.25 | 2.28 × 10−9 | 4.39 | 2 | (C+ + C3S) |
| C+ + C5S → C5 + + CS | 0.25 | 2.28 × 10−9 | 4.39 | 2 | (C+ + C3S) |
| C+ + C5S → C5 +CS+ | 0.25 | 2.28 × 10−9 | 4.39 | 2 | (C+ + C3S) |
| Miscellaneous | |||||
 + H2C3S → H3C3S+ + H2 |
1.00 | 4.10 × 10−9 | 2.37 | 2 | KIDA |
| HCO+ + H2C3S → H3C3S+ + CO | 1.00 | 1.53 × 10−9 | 2.37 | 2 | KIDA |
| H3C3S+ + e− → H2C3S + H | 4.00 × 10−8 | −0.70 | 0 | 1 | KIDA |
| H3C3S+ + e− → HC3S + H + H | 2.00 × 10−7 | −0.70 | 0 | 1 | KIDA |
| H3C3S+ + e− → CS + C2H2 + H | 2.00 × 10−7 | −0.70 | 0 | 1 | KIDA |
| H3C3S+ + e− → H2CCC + SH | 2.00 × 10−7 | −0.70 | 0 | 1 | KIDA |
| C+ + H2C3S → C3H + HCS+ | 1.00 | 2.17 × 10−9 | 2.37 | 2 | KIDA |
| C + H2C3S → CS + C3H2 | 3.00 × 10−10 | 0.00 | 0 | 1 | KIDA |
| S + CH2CCH → H2C3S + H | 1.00 × 10−10 | 0.00 | 0 | 1 | KIDA |
| S + CH2CCH → CS + C2H3 | 2.00 × 10−11 | 0.00 | 0 | 1 | KIDA |
| S + CH2CCH → HCS + C2H2 | 2.00 × 10−11 | 0.00 | 0 | 1 | KIDA |
 + HCCS → H2C2S+ + H2 |
1.00 | 2.90 × 10−9 | 2.39 | 2 | ( + H2CCS) |
| HCO+ + HCCS → H2C2S+ + CO | 1.00 | 1.17 × 10−9 | 2.39 | 2 | (HCO+ + H2CCS) |
Notes. For reactions of type 1, the rate coefficient is given by the expression k(T) = α (T/300)β exp(−γ/T). For reactions of type 2, the rate coefficient is given by the expression 
. Reactions from the KIDA database can be found at http://kida.astrophy.u-bordeaux.fr/.
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