星际介质中H $_2$和H $^-$辐射缔合形成H $_3^-$
Formation of H$_3^-$ by radiative association of H$_2$ and H$^-$ in the interstellar medium
摘要：
本文在密耦合框架下发展了一个原子和一个双原子分子的辐射缔合理论。我们将其应用于H $^-$与H $_2$的低能碰撞（低于0.5 eV）后H $_3^-$的形成。利用最近得到的H $_3^-$的势能面和永久偶极矩面，计算了H $_3^-$电子基态的最低振转能级，以及H $^-$与邻位和对位H $_2$辐射缔合形成H $_3^-$的截面.本文讨论了在高电离率的冷而致密的星际介质中形成和观测H-$_3^-$离子的可能性。这样的观测将是对星际介质中H $^-$存在的探测。
英文摘要：
We develop the theory of radiative association of an atom and a diatomic molecule within a close-coupling framework. We apply it to the formation of H$_3^-$ after the low energy collision (below 0.5 eV) of H$_2$ with H$^-$. Using recently obtained potential energy and permanent dipole moment surfaces of H$_3^-$, we calculate the lowest rovibrational levels of the H$_3^-$ electronic ground state, and the cross section for the formation of H$_3^-$ by radiative association between H$^-$ and ortho- and para-H$_2$. We discuss the possibility for the H$_3^-$ ion to be formed and observed in the cold and dense interstellar medium in an environment with a high ionization rate. Such an observation would be a probe for the presence of H$^-$ in the interstellar medium.
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