Angle-resolved ultraviolet photoelectron spectroscopic study of Si(001)-(2 x 1)/K and Si(001)-(2 x 1)/Cs surfaces.
Angle-resolved ultraviolet photoelectron spectroscopic study of Si(001)-(2 x 1)/K and Si(001)-(2 x 1)/Cs surfaces.
复制标题
Si(001)-(2 x 1)/K 和 Si(001)-(2 x 1)/Cs 表面的角分辨紫外光电子能谱研究。
DOI：
10.1103/physrevb.39.1125
复制
发表时间：
1989
期刊：
影响因子：
--
通讯作者：
Kono
中科院分区：
文献类型：
--
作者：
Enta;Kinoshita;Suzuki;Kono
测量了Si (001)-(2x1)/K和Si (001)-(2x1)/Cs表面的角分辨紫外光电子能谱（ARUPS）光谱，其碱金属原子覆盖范围从零到饱和。全覆盖Si (001)-(2x1)/K和Si (001)-(2x1)/Cs表面的价带光谱和相应的结合能与波矢量图表明，这两个表面是半导体的，与普遍接受的碱/Si（001）体系的一维和金属碱链的观点相反。对于全覆盖的Si (001)-(2x1)/K和Si (001)-(2x1)/Cs表面，提出了表面态能带的合理色散。尽管功函数发生了很大的变化，但发现K和Cs的最外层核能级的正发射ARUPS光谱在碱金属原子覆盖下基本不变。研究了衬底掺杂对ARUPS光谱的影响。
Angle-resolved ultraviolet-photoelectron-spectroscopy (ARUPS) spectra of the Si (001)-(2× 1)/K and Si (001)-(2× 1)/Cs surfaces have been measured for alkali-metal-atom coverages ranging from zero to saturation. Valence-band spectra and corresponding binding energy versus wave vector diagrams for the full-coverage Si (001)-(2× 1)/K and Si (001)-(2× 1)/Cs surfaces show that the two surfaces are semiconducting, in contrast to a generally accepted view of the one-dimensional and metallic alkali chain of the alkali/Si (001) systems. Plausible dispersions of surface-state bands are proposed for the full-coverage Si (001)-(2× 1)/K and Si (001)-(2× 1)/Cs surfaces. Normal-emission ARUPS spectra of outermost core levels of K and Cs have been found to be essentially invariant with alkali-metal-atom coverage in spite of large changes in work function. The effect of substrate doping on the ARUPS spectra has been examined.