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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >On the symmetry and degeneracy of H_3 ~+
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On the symmetry and degeneracy of H_3 ~+

机译：关于H_3〜+的对称性和简并性

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摘要

The fundamental molecular ion H_3 ~+ has impacted astronomy, chemistry, and physics, particularly since the discovery of its rovibrational spectrum. Consisting of three identical fermions, its properties are profoundly influenced by the requirements of exchange symmetry, most notably the nonexistence of its ground rotational state. Spectroscopy of H _3 ~+ is often used to infer the relative abundances of its two nuclear spin modifications, ortho- and para-H_3 ~+, which are important in areas as diverse as electron dissociative recombination and deuterium fractionation in cold interstellar clouds. In this paper, we explore in detail the impact of exchange symmetry on the states of H_3 ~+, with a particular focus on the state degeneracies necessary for converting spectral transition intensities to relative abundances. We address points of confusion in the literature surrounding these issues and discuss the implications for proton-transfer reactions of H_3 ~+ at low temperatures.
机译：基本分子离子H_3〜+影响了天文学，化学和物理学，尤其是自从发现其自振谱以来。由三个相同的费米子组成，它的性质受到交换对称性要求的深刻影响，最显着的是其基态旋转状态不存在。 H _3〜+的光谱通常用于推断其两个核自旋修饰的相对丰度，邻-和对-H_3〜+，这在冷星际云中电子离解重组和氘分馏等各种领域都很重要。在本文中，我们详细探讨了交换对称性对H_3〜+态的影响，尤其关注将光谱跃迁强度转换为相对丰度所必需的状态简并性。我们解决了围绕这些问题的文献中的混淆点，并讨论了低温下H_3〜+的质子转移反应的含义。

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