Table 3
Contribution of primary formation and destruction reactions of SiS at t =1 × 103 yr obtained from the model using the full chemical network, i.e., KIDA reactions plus the new ones studied in this work.
| Reaction | Contribution [%] |
|---|---|
| Formation of SiS | |
| Si + HS → H + SiS | 30.6 |
| S + SiC → C + SiS | 26.5 |
| Si + SO → O + SiS | 23.8 |
| HSiS+ + e− → H + SiS | 18.3 |
| Si + H2S → H2 + SiS | 0.70 |
| Destruction of SiS | |
| SiS + O → SiO + S | 95.9 |
| SiS + C → Si + CS | 4.00 |
| SiS + S+ → S + SiS+ | 0.10 |
Notes. The model considers a molecular cloud with T =10 K, n(H2) = 2 × 104 cm−3 and a cosmic-ray ionisation rate of 1.3 × 10−17 s−1 (see Fig. 5a).
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