暗云化学模式中OCS气相反应的评述
Review of OCS gas-phase reactions in dark cloud chemical models
摘要：
缔合反应S + CO { \to } OCS + hnu已被确定为是特别重要的预测气相OCS丰度的化学模式的乌云。我们进行了详细的从头计算，这个过程中，除了进行广泛的审查，涉及这种物种的中性-中性反应，这可能是重要的，在这样的环境中。据估计，这种缔合反应的速率常数比目前天体化学数据库中的速率常数小几个数量级。这个反应的新速率和其他过程的引入，特别是OH + CS { \to } OCS + H和C + OCS { \to } CO + CS，极大地改变了由乌云化学模型预测的OCS气相丰度。与TMC-1（CP）和L134 N（N）中观察结果的不一致表明OCS可能在晶粒表面形成，与甲醇的情况相同。对星际冰上固态外大陆架的观测支持了这一假设。
英文摘要：
The association reaction S + CO {\to} OCS + hnu has been identified as being particularly important for the prediction of gas-phase OCS abundances by chemical models of dark clouds. We performed detailed ab-initio calculations for this process in addition to undertaking an extensive review of the neutral-neutral reactions involving this species which might be important in such environments. The rate constant for this association reaction was estimated to be several orders of magnitude smaller than the one present in current astrochemical databases. The new rate for this reaction and the introduction of other processes, notably OH + CS {\to} OCS + H and C + OCS {\to} CO + CS, dramatically changes the OCS gas-phase abundance predicted by chemical models for dark clouds. The disagreement with observations in TMC-1 (CP) and L134N (N), suggests that OCS may be formed on grain surfaces as is the case for methanol. The observation of solid OCS on interstellar ices supports this hypothesis.
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