论文标题
Si+So $ _2 $碰撞和硅和硫轴承物种之间中立反应的扩展网络
The Si+SO$_2$ collision and an extended network of neutral-neutral reactions between silicon and sulphur bearing species
论文作者
论文摘要
SI+因此，研究了$ _2 $反应，以验证其对具有天体化学兴趣的分子的影响，例如SIS，SIO等。根据我们的结果，SI（$^3 $ p），因此$ _2 $反应无效地仅产生一氧化物SO和SIO作为产品。尚未发现有利的途径导致其他产品，并且这种反应不应导致sis丰度。此外，可以预测SIS在与O $ _2 $的碰撞中稳定，而S（$^3 $ p）+SIO $ _2 $和O（$^3 $ p）+osis也将产生So so so so so+sio。使用这些结果并从文献中收集进一步的实验和计算数据，我们提供了涉及含Si-barearch分子的中性反应的扩展网络。这些反应的效果是在原始的气体元密码中在原恒星冲击模型中检查的。这包括模拟震惊的气体从$i。$ primeval冷核演变的物理化学条件，$ ii。$ shock区域本身，$ iii。$，最终在冲击后的气体散装条件。 Emphasising on the cloud ages and including systematically these chemical reactions, we found that [SiS/H$_2$] can be of the order of $\sim$ 10$^{-8}$ in shocks that evolves from clouds of $t=1\times 10^6$ yr, whose values are mostly affected by the SiS+O $\longrightarrow$SiO+S reaction.在具有分子流出的来源的背景下，讨论了有关进一步模型的观点以及观察结果。
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 to our results Si($^3$P) and SO$_2$ react barrierlessly yielding only the monoxides SO and SiO as products. No favourable pathway has been found leading to other products, and this reaction should not contribute to SiS abundance. Furthermore, it is predicted that SiS is stable in collisions with O$_2$, and that S($^3$P)+SiO$_2$ and O($^3$P)+OSiS will also produce SO+SiO. Using these results and gathering further experimental and computational data from the literature, we provide an extended network of neutral-neutral reactions involving Si- and S-bearing molecules. The effects of these reactions were examined in a protostellar shock model, using the Nautilus gas-grain code. This consisted in simulating the physicochemical conditions of a shocked gas evolving from $i.$ primeval cold core, $ii.$ the shock region itself, $iii.$ and finally the gas bulk conditions after the passage of the shock. Emphasising on the cloud ages and including systematically these chemical reactions, we found that [SiS/H$_2$] can be of the order of $\sim$ 10$^{-8}$ in shocks that evolves from clouds of $t=1\times 10^6$ yr, whose values are mostly affected by the SiS+O $\longrightarrow$SiO+S reaction. Perspectives on further models along with observations are discussed in the context of sources harbouring molecular outflows.
