Abstract
We have carried out a back reflection X-ray standing wave (BRXSW) investigation of the geometric structure and degree of ordering of the system Rb Cu(111) as a function of Rb coverage. We observe no change in the Rb-Cu(111) perpendicular spacing as a function of coverage from saturation coverage of θ = 1 4 down to a coverage of θ = 1 16. We find a high degree of ordering of the Rb atoms perpendicular to the surface at all coverages, but a very low degree of order parallel to the Cu(111) surface. No differences in our results were detected for measurements at room temperature versus at ∼ 190 K.
Original language | English (US) |
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Pages (from-to) | 267-275 |
Number of pages | 9 |
Journal | Surface Science |
Volume | 344 |
Issue number | 3 |
DOIs | |
State | Published - Dec 30 1995 |
Externally published | Yes |
Funding
We would like to acknowledge fruitful discussions with J.N. Andersen and D.L. Adler. We would like to thank Dr. D. Zehner for providing the Cu(111) crystal used in this experiment. This research was carded out at the National Synchrotron Light Source at Brookhaven National Laboratory, which is sponsored by the US Department of Energy through contract number DE-AC02-76CH0006. For P. Xu and D. Heskett acknowledgement is made to the Donors of The Petroleum Research Fund, administered by the American Chemical Society, for partial support of this research. P. Xu and D. Heskett would also like to acknowledge partial support from the URI Council for Research. M.J. Bedzyk received partial support through ANL under DOE-BES contract No. W-31-109-ENG-38 and through the NSF-MRL program at NU under contract No. DMR-9120521.
Keywords
- Alkali metals
- Copper
- Low index single crystal surfaces
- Metallic surfaces
- Photon absorption spectroscopy
ASJC Scopus subject areas
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry