Abstract
Low energy electron diffraction measurements of the temperature dependence of the intensity of many diffraction beams from the (110) surface of a clean nickel crystal indicate that the mean square vibrational amplitude of surface atoms is greater than that of atoms in the bulk of the crystal. Vibration in the plane of the surface is anisotropic with u 2 [110] ∼ u 2 [001] > u 2 [1 1 ̄ 0] , which in turn are greater than the mean square vibrational amplitude of bulk atoms. The assignment of actual numerical values to these parameters requires additional refinement of the data.
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