Electron-impact rotational excitation of linear molecular ions
Electron-impact rotational excitation of linear molecular ions
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线性分子离子的电子撞击旋转激发
DOI：
10.1046/j.1365-8711.2001.04480.x
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发表时间：
2001
影响因子：
4.8
通讯作者：
J. Tennyson
中科院分区：
文献类型：
--
作者：
A. Faure;J. Tennyson
进行分子R矩阵计算以给出电子与线性分子离子碰撞的旋转激发率。计算了CO+、HCO+、NO+和H2+在10000K电子温度范围内的电子结构。给出了退激率和临界电子密度。结果表明，当分子离子具有大于2D的偶极时，广泛使用的库仑玻恩近似对Δ j = 1跃迁是有效的，但在研究电子碰撞转动激发时则不可靠.特别地，发现Δ j> 1的跃迁具有可观的速率，并且发现完全由短程效应主导。
Molecular R-matrix calculations are performed to give rotational excitation rates for electron collisions with linear molecular ions. Results are presented for CO+, HCO+, NO+ and H2+ up to electron temperatures of 10 000 K. De-excitation rates and critical electron densities are also given. It is shown that the widely used Coulomb-Born approximation is valid for Δj=1 transitions when the molecular ion has a dipole greater than about 2D, but otherwise is not reliable for studying electron-impact rotational excitation. In particular, transitions with Δj>1 are found to have appreciable rates and are found to be entirely dominated by short-range effects.