Near-threshold rotational and vibrational excitation of H 2 by electron impact: Theory and experiment
Near-threshold rotational and vibrational excitation of H 2 by electron impact: Theory and experiment
复制标题
电子碰撞对 H 2 的近阈值旋转和振动激发：理论与实验
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
ZLj Petrovic
中科院分区：
文献类型：
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作者：
M. Morrison;R. Crompton;B. Saha;ZLj Petrovic
描述了对低能e-H2散射的联合实验-理论攻击。从非相对论性薛定谔方程的高度收敛的数值解计算的横截面，使用一个参数自由相互作用势，首先比较从群实验的结果，后来被用来提高在第一振动阈值以上的能量群分析的准确性。为了提供进一步的观点，理论结果与其他各种实验数据进行了比较。动量转移和旋转激发截面的理论结果与群实验的结果非常一致，但振动激发截面的阈值行为存在未解决的显著差异。理论和实验方法都受到严格的审查，试图发现可能的错误来源，可以解释这种差异。未能找到可能的来源表明需要进一步的独立理论和实验工作来解决一个具有严重影响的问题。
A joint experimental-theoretical attack on low-energy e-H2 scattering is described. The cross sections calculated from a highly converged numerical solution of the nonrelativistic Schrodinger equation, using a parameter-free interaction potential, are first compared with results from swarm experiments, and are later used to improve the accuracy of the swarm analysis at energies above the first vibrational threshold. To provide further perspective, the theoretical results are compared with a variety of other experimental data. The theoretical results for the momentum-transfer and rotational-excitation cross sections are in excellent agreement with the results from swarm experiments, but there is an unresolved and significant difference in the threshold behaviour of the vibrational-excitation cross sections. Both the theoretical and experimental approaches are subjected to close scrutiny in an attempt to uncover possible sources of error that could explain this difference. The failure to locate likely sources points to the need for further independent theoretical and experimental work to resolve a problem that has serious implications.