Band mapping of surface states vs. adsorbate coverage
- Univ. of Oregon, Eugene, OR (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Univ. of Oregon, Eugene, OR (United States)
- Univ. of Wisconsin, Milwaukee, WI (United States)
- POSTECH, KyungBuk Pohang (Korea, Republic of)
The theory of electron bands, which arises from basic quantum mechanical principles, has been the cornerstone of solid state physics for over 60 years. Simply put, an energy band is an electron state in a solid whose energy varies with its momentum (similar to, but with a more complicated dependence than, how a free electron`s energy is proportional to its momentum squared). Much attention over the last 15 years has been given to the study of band structure of surfaces and interfaces, especially as the applications of these two-dimensional systems have become increasingly important to industry and science. The ultraESCA endstation at beamline 7.01 at the Advanced Light Source was developed for very high-energy - ({approximately}50 meV) and angular - (<1{degrees}) resolution photoemission studies of materials. The high flux (typically 10{sup 12} photons/sec) makes the detailed study of the evolution of bands possible. The authors are interested in learning how, when one forms a chemical bond between a metal and an overlaying atom or molecule, the resulting charge transfer to or from the adsorbate affects the surface bands. In some cases of interest, intermediate coverages lead to different band structure than at the extremes of clean and saturated surfaces. Surfaces of tungsten are particularly interesting, as their atomic geometry has been shown to be exquisitely sensitive to both the surface vibrational and electronic properties. In this study, the authors looked at the surface bands of tungsten ((110) surface), as a function both of coverage and mass of overlaying atoms. The adsorbed atoms were hydrogen and the alkali atoms lithium and cesium.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FG06-86ER45275
- OSTI ID:
- 603499
- Report Number(s):
- LBNL-39981; ON: DE97007345; TRN: 98:009519
- Resource Relation:
- Related Information: Is Part Of: Advanced light source: Compendium of user abstracts 1993--1996, 622 p.
- Country of Publication:
- United States
- Language:
- English
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