Analysis of direct transitions and surface-state features observed in photoemission from clean Al(111)
Analysis of direct transitions and surface-state features observed in photoemission from clean Al(111)
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清洁 Al(111) 光电发射中观察到的直接跃迁和表面态特征分析
DOI：
10.1103/physrevb.30.3028
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发表时间：
1984
影响因子：
3.7
通讯作者：
K. Kambe
中科院分区：
文献类型：
--
作者：
P. Hofmann;K. Kambe
在一个干净的铝（111）表面的角分辨光发射光谱中观察到清晰显示色散的结构。利用光子能量分别为16.85和21.2 eV的非偏振光和偏振光在不同的晶体方位角下采集数据。将实验确定的能带结构与简化模型的计算结果进行了比较。虽然一些特征归因于表面共振和表面态，但其他强色散结构可以通过直接体跃迁来解释。发现了一些附加特征（带底、部分间隙边缘、费米边缘），并讨论了它们的起源。
Structures clearly showing dispersion are observed in angle-resolved photoemission spectra from a clean Al(111) surface. Data were collected using unpolarized as well as polarized light at photon energies of 16.85 and 21.2 eV in different crystallographic azimuths. The experimentally-determined band structure is compared with the results of calculations using a simplified model. While some features are attributed to surface resonances and surface states, other strongly dispersive structures can be accounted for by direct bulk transitions. A few additional features (band bottom, partial gap edge, Fermi edge) are found and their origins are discussed.