Abstract
The surface structure of Ru(0 0 0 1) has been studied between 300 and 1870 K using X-ray diffraction. At 300 K, the outermost layer is contracted by 2.2(4)%, in agreement with the value determined by low-energy electron diffraction studies, but about half that predicted by ab initio calculations. H-adsorption appears to introduce disorder through an increased surface Debye-Waller factor and an increased step density, but does not significantly alter the interlayer spacing. Temperature-dependent studies of the clean surface structure indicate a thermal expansion of the first three interlayer distances that is slightly smaller than that of the bulk, accompanied by increasing vibrational motion comparable to that of the bulk.
| Original language | English |
|---|---|
| Pages (from-to) | 74-82 |
| Number of pages | 9 |
| Journal | Surface Science |
| Volume | 498 |
| Issue number | 1-2 |
| DOIs | |
| State | Published - Feb 1 2002 |
Funding
Sincere thanks to Gary Ownby for crystal preparation and quality control and to the Sandia, Livermore group for motivation. Research at ORNL was sponsored by the Department of Energy managed by UT-Battelle, LLC under contract DE-AC05-00OR22725. Research at BNL is supported by the Department of Energy under contract DE-AC02-98CH10886. This research was supported in part by an appointment to the ORNL Postdoctoral Research Associates Program administered jointly by Oak Ridge Institute for Science and Education and Oak Ridge National Laboratory.
Keywords
- Hydrogen atom
- Low index single crystal surfaces
- Ruthenium
- Single crystal surfaces
- Surface structure, morphology, roughness, and topography
- X-ray scattering, diffraction, and reflection