| Autor: |
Ezzehar, H., Stauffer, L., Dreyssé, H., Habar, M. |
| Zdroj: |
Surface Science; July 1995, Vol. 331 Issue: 1 p144-149, 6p |
| Abstrakt: |
We present a theoretical investigation of HPd(111)for low coverage. In a tight binding scheme, using the generalized phase shift and recursion method, we compute the interaction energies for pairs, trimers and tetramers of hydrogen impurities. Surface tetrahedral (A+) and subsurface octahedral (A−) interstitial positions are considered. We find that the interactions between pairs of A+and A−impurities located on two first neighbours type-A vertices are more attractive than the lateral interactions. Considering then trimer and tetramer interactions, we point out a tendency to the formation of a (√3 × √3)R30° superstructure, with hydrogen in both A+and A−positions, in agreement with the experimental data. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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