Abstract
Measurements of the surface Debye temperature for the (110) nickel face were performed in such a manner that difficulties in the interpretation known from the literature seem to have been avoided. A specular beam could reach a fluorescent screen for incidence angles 30° < β < 70°. A strong (00) beam was observed for (β ≈ 60° and electron energy E = 100–110 eV. For this beam, the dependence of its intensity on the sample temperature was measured and the effective Debye temperature was calculated to be equal to not more than 216 ± 10 K. Owing to the large β, the penetration depth of electrons should be equal to about 1.2 Å and only the first layer of atoms is responsible for diffraction in this case. Besides, it is shown that single scattering processes are dominant in our experimental conditions. So, the effective Debye temperature measured should be very close to the surface Debye temperature.
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