H3 +与H2碰撞的低温核自旋平衡
The Low-Temperature Nuclear Spin Equilibrium of H3+ in Collisions with H2
摘要：
最近在弥漫星际视线中对H2和H3+的观测揭示了这两个物种的核自旋激发温度的差异。这种差异令人惊讶，因为H3+和H2应该在分子云中经历频繁的热化碰撞。基本的H3+ / H2碰撞系统在低温下的非热行为被认为是观察到的不规则布居的可能原因。在这里，我们提出了测量的稳态邻/对位比的H3+在碰撞与H2分子在温度可变的射频离子阱之间的45-100 K。实验结果接近预期的热结果，他们同意与以前的微正则模型非常好。我们简要地讨论了扩散星际介质的化学实验结果的影响。
英文摘要：
Recent observations of H2 and H3+ in diffuse interstellar sightlines revealed a difference in the nuclear spin excitation temperatures of the two species. This discrepancy comes as a surprise, as H3+ and H2 should undergo frequent thermalizing collisions in molecular clouds. Non-thermal behavior of the fundamental H3+ / H2 collision system at low temperatures was considered as a possible cause for the observed irregular populations. Here, we present measurements of the steady-state ortho/para ratio of H3+ in collisions with H2 molecules in a temperature-variable radiofrequency ion trap between 45-100 K. The experimental results are close to the expected thermal outcome and they agree very well with a previous micro-canonical model. We briefly discuss the implications of the experimental results for the chemistry of the diffuse interstellar medium.
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