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arXiv 2203.17124physics.atom-phphysics.chem-ph
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Laser -通过电子碰撞探测分子离子的旋转冷却

Laser-probing the rotational cooling of molecular ions by electron collisions

Ábel Kálosi, Manfred Grieser, Robert von Hahn, Ulrich Hechtfischer, Claude Krantz, Holger Kreckel, Damian Müll, Daniel Paul, Daniel Wolf Savin, Patrick Wilhelm,… 展开作者

Ábel Kálosi, Manfred Grieser, Robert von Hahn, Ulrich Hechtfischer, Claude Krantz, Holger Kreckel, Damian Müll, Daniel Paul, Daniel Wolf Savin, Patrick Wilhelm, Andreas Wolf, Oldřich Novotný

摘要:

我们提出了非弹性电子碰撞的CH $^+$分子离子的旋转冷却和激发速率的状态选择测量。实验在低温储存环上进行,利用单能电子束以匹配的速度与状态敏感的激光解离的CH $^+$离子的旋转水平人口的同时监测相结合。采用存储时间高达600秒,我们创造的条件下,电子诱导冷却到$J = 0$基态占主导地位的辐射弛豫,允许实验测定的非弹性电子碰撞率基准国家的最先进的理论计算。在更广泛的范围内,我们的实验为探测各种等离子体环境中相关的各种分子离子的非弹性电子碰撞铺平了道路。

英文摘要:

We present state-selected measurements of rotational cooling and excitation rates of CH$^+$ molecular ions by inelastic electron collisions. The experiments are carried out at the Cryogenic Storage Ring, making use of a monoenergetic electron beam at matched velocity in combination with state-sensitive laser-dissociation of the CH$^+$ ions for simultaneous monitoring of the rotational level populations. Employing storage times of up to 600 s, we create conditions where electron-induced cooling to the $J = 0$ ground state dominates over radiative relaxation, allowing for the experimental determination of inelastic electron collision rates to benchmark state-of-the-art theoretical calculations. On a broader scale, our experiments pave the way to probe inelastic electron collisions for a variety of molecular ions relevant in various plasma environments.

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