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The work function of submonolayer cesium-covered gold: a photoelectron spectroscopy study
J L LaRue1, J D White, N H Nahler
1Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106-9510, USA.
The Journal of Chemical Physics
|July 16, 2008
Summary
Researchers measured the work function of cesium (Cs) on a gold (Au)(111) surface using spectroscopy. The work function was found to be 1.61+/-0.08 eV at a specific Cs coverage, supporting prior research.
Area of Science:
- Surface Science
- Condensed Matter Physics
- Materials Science
Background:
- The work function of metal surfaces is crucial for understanding electron emission phenomena.
- Cesium (Cs) adsorption on gold (Au)(111) is a model system for studying surface electronic properties.
Purpose of the Study:
- To accurately measure the work function of a Au(111) surface with submonolayer Cs coverage.
- To validate previous assumptions in vibrationally promoted electron emission studies.
Main Methods:
- Utilized visible and X-ray photoelectron spectroscopy (XPS).
- Investigated a well-defined submonolayer coverage of Cs on a Au(111) substrate.
- Employed a He-Ne laser to identify specific Cs coverage.
Main Results:
- Determined the work function to be 1.61 ± 0.08 eV at a Cs coverage corresponding to a photoemission maximum.
- Observed consistency with prior assumptions used in analyzing electron emission.
Conclusions:
- The measured work function provides a precise value for Cs/Au(111) at a specific coverage.
- The findings support the use of this system in studying electron emission mechanisms.
- Potential Cs layer structures were discussed, offering insights into surface morphology.
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