H $_2$碰撞引起的CO的转动猝灭
Rotational quenching of CO due to H$_2$ collisions
摘要：
本文给出了CO中由对位和邻位H $_2$碰撞引起的态-态转动跃迁的速率系数。结果是用紧耦合方法和耦合态近似得到的，采用Jankowski & Szalewicz（2005）的CO-H $_2$相互作用势。速率系数为1和3000 K之间的温度，和CO（$v=0,j$）淬火从$j=1-40$所有较低的$j^\prime$水平。与以前的计算使用较早的潜在的比较显示出一些差异，特别是在低温和旋转过渡涉及大$|Δj|$。两个势面中范德华相互作用阱深的不同导致了影响低温速率系数的截面能量依赖性的不同共振结构。简要讨论了远红外观测天体物理环境的应用。
英文摘要：
Rate coefficients for state-to-state rotational transitions in CO induced by both para- and ortho-H$_2$ collisions are presented. The results were obtained using the close-coupling method and the coupled-states approximation, with the CO-H$_2$ interaction potential of Jankowski & Szalewicz (2005). Rate coefficients are presented for temperatures between 1 and 3000 K, and for CO($v=0,j$) quenching from $j=1-40$ to all lower $j^\prime$ levels. Comparisons with previous calculations using an earlier potential show some discrepancies, especially at low temperatures and for rotational transitions involving large $|Δj|$. The differences in the well depths of the van der Waals interactions in the two potential surfaces lead to different resonance structures in the energy dependence of the cross sections which influence the low temperature rate coefficients. Applications to far infrared observations of astrophysical environments are briefly discussed.
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