Laser Probing of the Rotational Cooling of Molecular Ions by Electron Collisions
Laser Probing of the Rotational Cooling of Molecular Ions by Electron Collisions
复制标题
电子碰撞对分子离子旋转冷却的激光探测
DOI：
10.1103/physrevlett.128.183402
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发表时间：
2022
影响因子：
8.6
通讯作者：
Wilhelm, Patrick
中科院分区：
文献类型：
--
作者：
Kálosi, Ábel;Grieser, Manfred;von Hahn, Robert;Hechtfischer, Ulrich;Krantz, Claude;Kreckel, Holger;Müll, Damian;Paul, Daniel;Savin, Daniel W.;Wilhelm, Patrick
本文介绍了用非弹性电子碰撞方法对分子离子的转动冷却和激发速率的选态测量。实验是在低温储存环上进行的，利用单能电子束以匹配的速度与状态敏感的激光解离的theions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thegrowth状态占主导地位的辐射松弛，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。
We present state-selected measurements of rotational cooling and excitation rates ofmolecular ions by inelastic electron collisions. The experiments are carried out at a cryogenic storage ring, making use of a monoenergetic electron beam at matched velocity in combination with state-sensitive laser dissociation of theions for simultaneous monitoring of the rotational level populations. Employing storage times of up to 600 s, we create conditions where electron-induced cooling to theground 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.