Direct observation of distorted wave effects in ethylene using the (e,2e) reaction.
Direct observation of distorted wave effects in ethylene using the (e,2e) reaction.
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DOI：
10.1103/physrevlett.94.163201
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发表时间：
2005-04
影响因子：
8.6
通讯作者：
X. Ren;C. Ning;J. Deng;S. F. Zhang;G. Su;F. Huang;G. Li
中科院分区：
文献类型：
--
作者：
X. Ren;C. Ning;J. Deng;S. F. Zhang;G. Su;F. Huang;G. Li
本文报道了在400-2400 eV的不同碰撞能量下，利用(e，2e)反应直接测量乙烯的电子动量分布。在低动量区和高动量区观察到1b(3G)轨道的(e，2e)截面与平面波脉冲近似计算的“翻转”效应，并且这种差异随着碰撞电子能量的增加而减小。结果表明，观测到的差异是由于分子中的扭曲波效应造成的，而利用分子中的扭曲波进行适当的理论计算至今还不能实现。
We report here the direct measurements of electron momentum distributions for ethylene using the (e,2e) reaction at different impact energies from 400 to 2400 eV. The "turn up" effects in the (e,2e) cross sections of the 1b(3g) orbital compared with the plane-wave impulse approximation calculations were observed at low and high momentum regions, and such discrepancies become smaller with the increase of the impact electron energies. It is suggested that the observed discrepancies are due to the distorted-wave effects in molecules, while appropriate theoretical calculations using distorted waves in molecules could not be achieved until now.