Surface molecules and chemisorption. II. Photoemission angular distributions
Surface molecules and chemisorption. II. Photoemission angular distributions
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表面分子和化学吸附。
DOI：
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发表时间：
1974
期刊：
影响因子：
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通讯作者：
J. W. Gadzuk
中科院分区：
文献类型：
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作者：
J. W. Gadzuk
本文提出了一种从化学吸附原子的亚单层膜中光发射电子的角分布理论。在安德森模型的表面分子极限内处理化学吸附。结果表明，区分固态光电子发射和原子光电离的关键特征是光激发过程中留下的空穴的局部化和原子或分子轨道的优先取向（在固体或化学吸附原子的光电子发射中）。得到了空间取向的原子和表面分子的微分光电离截面或角分布，并给出了投影在平行于表面的平面荧光屏上的恒定发射强度的轮廓。结果表明，化学吸附键的几何形状可以确定从这样的测量。
A theory of the angular distributions of electrons photoemitted from submonolayer films of chemisorbed atoms is presented. Chemisorption is treated within the surface-molecule limit of the Anderson model. It is shown that the key features which differentiate between solid-state photoemission and atomic photoionization are the localization of the hole left behind in the photoexcitation process and the preferential orientation of atomic or molecular orbitals (in photoemission from solids or chemisorbed atoms). The differential photoionization cross sections or angular distributions for spatially oriented atoms and surface molecules are obtained and contours of constant emission intensity, as projected on a flat fluorescent screen which is parallel to the surface, are presented. It is shown that the chemisorption bonding geometry can be ascertained from such measurements.