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arXiv 1905.02130quant-phphysics.atom-ph
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双原子分子离子与原子离子碰撞中的旋转态变化

Rotational state changes in collisions of diatomic molecular ions with atomic ions

Universität Kassel(卡塞尔大学);Universidad Autónoma de San Luis Potosí(圣路易斯波托西自治大学);Aarhus University(奥胡斯大学);Freie Universität Berlin(柏林自由大学)

J. Martin Berglund, Michael Drewsen, Christiane P. Koch

AI总结:

研究双原子分子离子与原子离子碰撞中旋转态变化的机制,通过数值模拟和解析近似,推导出碰撞能量和分子参数对旋转激发的影响,为分子离子的激光冷却提供理论基础。

摘要:

我们研究了双原子分子离子(极性或非极性)与原子离子单次碰撞中的旋转态变化。由于分子离子的角动量自由度与原子离子的电场相互作用,旋转态变化可能发生。由于平移和旋转运动的时间和能量尺度差异很大,我们可以经典地处理碰撞并仅量子机械地描述旋转。我们首先通过数值模拟研究了多个示例系统,然后推导出碰撞中每碰撞的旋转激发的闭式近似,这取决于散射能和分子参数。这些发现为估计通过激光冷却的原子离子对分子离子进行sympathetic冷却时积累的旋转激发提供了基础,该过程涉及许多单次碰撞。

英文摘要:

We investigate rotational state changes in a single collision of diatomic molecular ions, polar or apolar, with an atomic ion. Rotational state changes may occur since the angular degree of freedom of the molecular ions interacts with the electric field due to the atomic ion. Thanks to the very different time and energy scales of translational and rotational motion, we may treat the collision classically and describe only the rotations quantum mechanically. We first investigate a number of example systems numerically and then derive closed-form approximations for the rotational excitation per collision, depending on the scattering energy and the molecular parameters. These findings provide the basis for estimating the accumulated rotational excitation in sympathetic cooling of molecular ions by laser-cooled atomic ions [arXiv:2410.22458 ] which involves many single collisions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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