Publication: Giant Vibrations of Impurity Atoms on a Crystal Surface
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Date
1992
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American Physical Society (APS)
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Martinez, Robert E., E. Fontes, J. A. Golovchenko, and J. R. Patel. 1992. Giant Vibrations of Impurity Atoms on a Crystal Surface. Physical Review Letters 69, no. 7: 1061–1064. doi: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.
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