ROLE OF THE HE ATOM SURFACE POTENTIAL ON THE CU(001) PHONON DETERMINATION

A. Franchini, G. Santoro, V. Bortolani, A. Bellman, D. Cvetko, L. Floreano, A. Morgante, M. Peloi, F. Tommasini and T. Zambelli
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A. Franchini: Dipartimento di Fisica, Universitá di Modena, Via Campi 213/A, 41100 Modena, Italy
G. Santoro: Dipartimento di Fisica, Universitá di Modena, Via Campi 213/A, 41100 Modena, Italy
V. Bortolani: Dipartimento di Fisica, Universitá di Modena, Via Campi 213/A, 41100 Modena, Italy
A. Bellman: Laboratorio TASC, Padriciano 99, 34012 Trieste, Italy
D. Cvetko: Laboratorio TASC, Padriciano 99, 34012 Trieste, Italy
L. Floreano: Laboratorio TASC, Padriciano 99, 34012 Trieste, Italy
A. Morgante: Laboratorio TASC, Padriciano 99, 34012 Trieste, Italy
M. Peloi: Laboratorio TASC, Padriciano 99, 34012 Trieste, Italy
F. Tommasini: Laboratorio TASC, Padriciano 99, 34012 Trieste, Italy
T. Zambelli: Laboratorio TASC, Padriciano 99, 34012 Trieste, Italy

Surface Review and Letters (SRL), 1994, vol. 01, issue 01, 67-74

Abstract: We present new measurements of He atom inelastic scattering from the (001) surface of Copper. Our results confirmed the recent data obtained in Gottingen and show that at large momentum transfer in the$\bar \Gamma \bar M$direction the intensity of the longitudinal resonance is larger than that of the Rayleigh wave. We interpret these results by evaluating the reflection coefficient in the Distorted Wave Born Approximation. By taking the He surface interaction potential as a sum of nonspherical pairwise potential we are able to explain quantitatively the behavior of the experimental spectra.

Date: 1994
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DOI: 10.1142/S0218625X94000096

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