Structural parameters of Pd(110) and Pt(110)-(1x2) in the temperature range 300-900 K studied by low-energy ion scattering

Abstract

Pd(110) and Pt(110)(1 x 2) are studied by low-energy ion scattering using two scattering modes, i.e. surface blocking and NICISS (neutral impact collision ion-scattering spectrometry). The data give information on the surface structure and Vibrations of surface atoms in the temperature range 300-900 K. The Pd(110) surface shows roughening at 550 K. There is no evidence for an anomaly of the surface thermal vibrations. The average thermal vibrational amplitudes of the surface atoms are determined for the [1 (1) over bar 0] and [1 (1) over bar 2] directions, and correspond to Debye temperatures of 149 and 100 K, respectively. The results are compared with the respective values for Pt(110). (C) 1997 Elsevier Science B.V.