An electron energy loss spectroscopy study of resonance population in ethylene chemisorbed on Pd(110)
An electron energy loss spectroscopy study of resonance population in ethylene chemisorbed on Pd(110)
复制标题
Pd(110)化学吸附乙烯共振布居的电子能量损失谱研究
DOI：
10.1063/1.1305891
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
J. Yoshinobu
中科院分区：
文献类型：
--
作者：
H. Okuyama;H. Kato;M. Kawai;J. Yoshinobu
利用高分辨电子能量损失谱（HREELS）研究了乙烯在Pd（110）表面化学吸附的振动损失随能量和角度的变化。在电子初级能量为1.3eV时，观察到C-H伸缩模的共振增强。结果表明，共振截面是显着依赖于电子入射方向。当电子入射方向沿着C-C轴时，共振被禁止，这可以用入射平面波与未占轨道的重叠积分定性地解释.基于乙烯在[110]方向上的各向异性吸附，C-C轴优先沿[110]方向沿着，我们将共振态指定为2b 2u。结果进行了比较，通过近边X射线吸收精细结构（NEXAFS）。
We investigated energy and angle dependencies of vibrational losses of ethylene chemisorbed on Pd(110) by means of high-resolution electron energy loss spectroscopy (HREELS). A resonant enhancement of the C–H stretching modes is observed at the electron primary energy of ∼1.3 eV. It is shown that the resonance cross section is significantly dependent on the electron incidence direction. The resonance is forbidden when the electron incidence direction is aligned along the C–C axis, which is qualitatively explained in terms of the overlap integral between the incident plane wave and the unoccupied orbital. Based on the previous finding that ethylene is anisotropically adsorbed with the C–C axis preferentially aligned along the [110] direction, we assign the resonance state as 2b2u. The results are compared to those obtained by near-edge x-ray absorption fine structure (NEXAFS).