Electron scattering in ethene : Excitation of the a 3B1u state, elastic scattering, and vibrational excitation
Electron scattering in ethene : Excitation of the a 3B1u state, elastic scattering, and vibrational excitation
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乙烯中的电子散射：a 3B1u 态的激发、弹性散射和振动激发
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
V. McKoy
中科院分区：
文献类型：
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作者：
M. Allan;C. Winstead;V. McKoy
给出了低能电子从乙烯散射的实验和计算的绝对微分截面。重点讨论了a3b1u3 （pi,pi*）态的激发，并给出了选定的弹性和振动激发截面。与先前的计算结果相比，前者几乎大了2倍，而本文的计算结果与阈值区域的实验三重态激发截面非常吻合。这种改进主要是由于目标极化的加入，使得π *共振的位置得到了适当的定位，π *共振的高能尾主导了阈值附近的三重态激发。在考虑目标极化的情况下，目前的实验弹性截面与最近的计算结果吻合得很好。
Experimental and calculated absolute differential cross sections for the scattering of low-energy electrons from ethene are presented. Emphasis is on the excitation of the a 3B1u 3(pi,pi*) state, but selected elastic and vibrational excitation cross sections are also given. In contrast to earlier calculations, which were nearly a factor of 2 too large, the present calculation agrees very well with the experimental triplet excitation cross section in the threshold region. The improvement is due primarily to the inclusion of target polarization, which results in proper positioning of the pi* resonance, whose high-energy tail dominates the triplet state excitation near threshold. The present experimental elastic cross sections agree very well with recent calculations taking into account target polarization.