Near-threshold rotational excitation of molecular ions by electron impact
Near-threshold rotational excitation of molecular ions by electron impact
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通过电子碰撞对分子离子进行近阈值旋转激发
DOI:
10.1088/0953-4075/39/20/023
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发表时间:
2006
期刊:
影响因子:
--
通讯作者:
Faure A
中科院分区:
文献类型:
--
作者:
Faure A
New cross sections for the rotational excitation of H+ 3 by electrons are calculated ab initio at low impact energies. The validity of the adiabatic-nuclei-rotation (ANR) approximation, combined with R-matrix wavefunctions, is assessed by comparison with rovibrational quantum defect theory calculations based on the treatment of Kokoouline and Greene (2003 Phys. Rev. A 68 012703). Pure ANR excitation cross sections are shown to be accurate down to threshold, except in the presence of large oscillating Rydberg resonances. These resonances occur for transitions with ΔJ= 1 and are caused by closed-channel effects. A simple analytic formula is derived for averaging the rotational probabilities over such resonances in a 3-channel problem. In accord with the Wigner law for an attractive Coulomb field, rotational excitation cross sections are shown to be large and finite at threshold, with a significant but moderate contribution from closed-channels.
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DOI:
--
发表时间:
1956
期刊:
影响因子:
--
作者:
D. Chase
通讯作者:
D. Chase
影响因子:
2.9
作者:
S. Chu
通讯作者:
S. Chu
DOI:
10.1046/j.1365-8711.2001.04480.x
发表时间:
2001
影响因子:
4.8
作者:
A. Faure;J. Tennyson
通讯作者:
J. Tennyson
影响因子:
2.9
作者:
V. Kokoouline;C. Greene
通讯作者:
C. Greene
DOI:
--
发表时间:
1963
期刊:
影响因子:
--
作者:
R. Stabler
通讯作者:
R. Stabler