HCN、HNC、DCN和DNC的电子碰撞转动和超精细激发
Electron-impact rotational and hyperfine excitation of HCN, HNC, DCN and DNC
摘要：
用分子{ \bf R}矩阵方法结合绝热核转动近似（ANR）研究了HCN和HNC同位素的热电子碰撞转动激发.速率系数得到的电子温度在5 $-$-6000 K的范围内，并为所有级别之间的过渡到J=8。超精细率也来自使用无限阶突然（IOS）缩放方法。它表明，占主导地位的转动跃迁是偶极允许的，这是那些$ΔJ=1$。超精细倾向规则$ΔJ=ΔF$被发现是强于在He $-$ HCN碰撞的情况下。对于偶极允许的跃迁，电子碰撞率被证明是超过那些由He原子的HCN激发6个数量级。因此，在电子分数大于10 $^{-6}$的来源中，例如在星际激波和彗星中，HCN和HNC同位素体的任何详细的总体模型中，都应包括目前的速率。
英文摘要：
Rotational excitation of isotopologues of HCN and HNC by thermal electron-impact is studied using the molecular {\bf R}-matrix method combined with the adiabatic-nuclei-rotation (ANR) approximation. Rate coefficients are obtained for electron temperatures in the range 5$-$6000 K and for transitions among all levels up to J=8. Hyperfine rates are also derived using the infinite-order-sudden (IOS) scaling method. It is shown that the dominant rotational transitions are dipole allowed, that is those for which $ΔJ=1$. The hyperfine propensity rule $ΔJ=ΔF$ is found to be stronger than in the case of He$-$HCN collisions. For dipole allowed transitions, electron-impact rates are shown to exceed those for excitation of HCN by He atoms by 6 orders of magnitude. As a result, the present rates should be included in any detailed population model of isotopologues of HCN and HNC in sources where the electron fraction is larger than 10$^{-6}$, for example in interstellar shocks and comets.
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