HYDROGEN CHEMISORPTION ON SI(111)7 X 7 STUDIED WITH SURFACE-SENSITIVE CORE-LEVEL SPECTROSCOPY AND ANGLE-RESOLVED PHOTOEMISSION
HYDROGEN CHEMISORPTION ON SI(111)7 X 7 STUDIED WITH SURFACE-SENSITIVE CORE-LEVEL SPECTROSCOPY AND ANGLE-RESOLVED PHOTOEMISSION
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DOI：
10.1103/physrevb.41.1521
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发表时间：
1990-01-15
影响因子：
3.7
通讯作者：
UHRBERG, RIG
中科院分区：
文献类型：
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作者：
KARLSSON, CJ;LANDEMARK, E;UHRBERG, RIG
为了确定Si（111）“7× 1”：H和Si (111) 7× 7表面的表面核能级位移，以及确定“7× 1”：H表面在体带隙中的费米能级位置，对Si 2p核能级进行了光电子能谱分析。角分辨紫外光电子能谱用于测定氢暴露表面上表面态的初始能量与k平行色散的关系。这些测量结果表明，氢暴露后，在7x7单元胞内形成了一氢化物相。7× 7表面的核能级光谱结果与先前的结果在定性上是一致的，但我们认为，与先前的解释相反，转移到较低结合能的表面成分对应于剩余原子，而不是附着原子。
Photoelectron spectroscopy of the Si 2p core level has been performed in order to determine surface core-level shifts for the Si (111)‘‘7× 1’’: H and Si (111) 7× 7 surfaces, as well as to determine the Fermi-level position in the bulk band gap for the ‘‘7× 1’’: H surface. Angle-resolved ultraviolet photoelectron spectroscopy has been used to determine the initial energy versus k-parallel dispersion for the surface state on the hydrogen-exposed surface. The results of these measurements imply that the monohydride phase is formed within the 7× 7 unit cell after the hydrogen exposure. The core-level spectroscopy results obtained for the 7× 7 surface are in good qualitative agreement with earlier results, but we suggest, in contradiction to a previous interpretation, that the surface component which shifted to lower binding energy corresponds to the rest atoms and not to the adatoms.