Location of hydrogen adsorbed on Rh(111) studied by low-energy electron diffraction and nuclear reaction analysis
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043 (Japan)
The structures of clean and hydrogen-adsorbed Rh(111) surfaces were investigated by dynamical low-energy electron-diffraction (LEED) analysis. Exposure of D{sub 2} induced no additional LEED patterns except for (1x1). Surface-layer relaxation occurs vertically on both clean and D-saturated surfaces. On the clean surface, the interlayer distance between the first and second layers (d{sub 12}) is smaller by 1.2({+-}0.6)% than the corresponding bulk distance of 2.194 A. On the other hand, the contraction of d{sub 12} is removed on the D-saturated surface. Detailed LEED analysis demonstrates that the D atoms are adsorbed on the fcc threefold hollow sites. The absolute saturation coverage of H on Rh(111) was determined to be 0.84 ML by nuclear reaction analysis (NRA). Moreover, the zero-point vibrational energy of H was derived from the analysis of the NRA resonance profile, which is discussed in comparison with the results of high-resolution electron-energy-loss spectroscopy.
- OSTI ID:
- 20951551
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 75, Issue 23; Other Information: DOI: 10.1103/PhysRevB.75.235434; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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