We report detailed He atom scattering measurements of the phonon linewidth for the Rayleigh mode S-1 and the resonant mode S-3 of Ag(110) along the whole <(Gamma) over bar><(Y) over bar> side of the surface Brillouin zone as a function of the sample temperature. The novel behaviour observed for the resonance linewidth is explained by including the mixed-mode nature into the anharmonic calculations performed within the framework of the Born-von Karman model.
Anomalous linewidth behavior of the S3 surface resonance on Ag(110) / G., Bracco; L., Bruschi; R., Tatarek; Franchini, Anna; Bortolani, Virginio; Santoro, Giorgio. - In: EUROPHYSICS LETTERS. - ISSN 0295-5075. - STAMPA. - 34:(1996), pp. 687-692. [10.1209/epl/i1996-00575-8]