Laser-induced fluorescence measurements of rotationally resolved velocity distributions for CO+ drifted in He
Laser-induced fluorescence measurements of rotationally resolved velocity distributions for CO+ drifted in He
复制标题
激光诱导荧光测量氦气中漂移的 CO 的旋转分辨速度分布
DOI：
10.1063/1.460167
复制
发表时间：
1991
影响因子：
4.4
通讯作者：
S. Leone
中科院分区：
文献类型：
--
作者：
Ch. Lauenstein;M. Bastian;V. Bierbaum;S. M. Penn;S. Leone
测量CO+在He缓冲气体中的离子速度分布作为外加电场的函数。在不同的初始旋转状态下，激光束平行或垂直于漂移速度矢量传播，单频激光诱导荧光得到了这些分布。观测到的E/N在0 - 13td范围内，所有分布都可以用麦克斯韦公式很好地表示。根据平均速度随电场的变化计算，迁移率从极低电场时的18.7±1.0 cm2 V−1 s−1增加到13 Td时的26.4±0.7 cm2 V−1 s−1。从多普勒谱线的宽度出发，计算了平动“温度”，并将其与简单的吸引和排斥麦克斯韦模型作为场的函数进行了比较。测量值与原子离子系统的预测结果不一致。从碰撞中的旋转非弹性能量传递的角度讨论了两者的差异。
Measurements of ion‐velocity distributions of CO+ in a He buffer gas are presented as a function of an applied electric field. The distributions are obtained by single frequency, laser‐induced fluorescence from various initial rotational states with the laser beam propagating parallel and perpendicular to the drift velocity vector. All distributions are well represented by a Maxwellian for the observed E/N range of 0–13 Td. The reduced mobilities, calculated from the shift of the mean velocity as a function of electric field, increase from 18.7±1.0 cm2 V−1 s−1 at very low fields to 26.4±0.7 cm2 V−1 s−1 at 13 Td. From the width of the Doppler profiles, translational ‘‘temperatures’’ are calculated, which are compared to simple attractive and repulsive Maxwell models as a function of the field. The measured values disagree with the predictions, which are well established for atomic ion systems. The differences are discussed in terms of rotationally inelastic energy transfer in the collisions, which is predi...