Turn-up effects at low momentum for the highest occupied molecular orbital of oxygen at various impact energies by electron momentum spectroscopy
Turn-up effects at low momentum for the highest occupied molecular orbital of oxygen at various impact energies by electron momentum spectroscopy
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DOI：
10.1103/physreva.73.022704
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发表时间：
2006-02
影响因子：
2.9
通讯作者：
C. Ning;X. Ren;J. Deng;G. Su;S. F. Zhang;G. Li
中科院分区：
文献类型：
--
作者：
C. Ning;X. Ren;J. Deng;G. Su;S. F. Zhang;G. Li
最近，在（e，2e）电离截面的低动量区观察到了意想不到的高强度现象，称为翻转效应。本工作通过电子动量谱系统地研究了在400、600、800、1200、1800和2400 eV的各种撞击能量下氧的最高占据分子轨道的这种效应。随着撞击能量的下降，这种转向变得更高，这可以用扭曲波解释定性地预测。然而，这也可能是由于一些其他的动态相互作用，如动态相关性。由于氧分子是具有这种效应的最简单的多中心系统，因此该实验结果可以作为精确计算分子系统中这种效应的实验平台。
The unexpected higher intensity at low momentum region in (e,2e) ionization cross sections, as called turn-up effect, was observed recently. This work systemically investigated this effect for the highest occupied molecular orbital of oxygen at various impact energies of 400, 600, 800, 1200, 1800, and 2400 eV by electron momentum spectroscopy. This turn-up became higher as the impact energy declined, which can be qualitatively predicted by the distorted wave explanation. However, it may be also due to some other dynamic interaction, such as the dynamic correlation. Since the oxygen molecule is the simplest multicenter system with such effects, this experimental result could be a test-bed for the accurate calculation of this effect in the molecular system.