Giant vibrations of impurity atoms on a crystal surface
- 17 August 1992
- journal article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 69 (7), 1061-1064
- https://doi.org/10.1103/physrevlett.69.1061
Abstract
We have measured extremely large anisotropic thermal vibrations of gallium adatoms on a Si(111) surface using x-ray standing waves. At 830 K the rms amplitude normal to the surface is 0.47±0.02 Å while the parallel amplitude is 0.30±0.02 Å. The temperature dependence of these amplitudes deviates significantly from that expected from Debye theory and suggests a significant thermal softening of the surface bonding at elevated temperatures.Keywords
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