The Si + SO2 collision and an extended network of neutral–neutral reactions between silicon and sulphur bearing species

The Si+SO$_2$ reaction is investigated to verify its impact on the abundances of molecules with astrochemical interest, such as SiS, SiO, SO and others. According our results Si($^3$P) SO$_2$ react barrierlessly yielding only monoxides SiO products. No favourable pathway has been found leading other products, this should not contribute SiS abundance. Furthermore, it predicted that stable in collisions O$_2$, S($^3$P)+SiO$_2$ O($^3$P)+OSiS will also produce SO+SiO. Using these gathering further experimental computational data from literature, we provide an extended network neutral-neutral reactions involving Si- S-bearing molecules. effects were examined a protostellar shock model, using Nautilus gas-grain code. This consisted simulating physicochemical conditions shocked gas evolving $i.$ primeval cold core, $ii.$ region itself, $iii.$ finally bulk after passage shock. Emphasising cloud ages including systematically chemical reactions, [SiS/H$_2$] can be order $\sim$ 10$^{-8}$ shocks evolves clouds $t=1\times 10^6$ yr, whose values are mostly affected by SiS+O $\longrightarrow$SiO+S reaction. Perspectives models along observations discussed context sources harbouring molecular outflows.