Surface phonons of the nearly-free-electron metal Al(111) have been measured by high-resolution He-atom time-of-flight experiments for four different directions. This is the first surface which shows no evidence for an anomalous resonant mode found on the noble metals and Pt and attributed to a strong (≊50%) reduction of surface lateral force constants. By fitting the time-of-flight spectra via a lattice-dynamical simulation the surface interlayer force constant is found to agree to within ±3% with the bulk value and the lateral force constant reduction is less than 20%.
Phonons at the surface of the nearly-free-electron metal Al(111): realisation of an ideal surface / LOCK, A.; TOENNIES, J. P.; WOLL, C. H.; BORTOLANI, Virginio; SANTORO, Giorgio; FRANCHINI, Anna. - In: PHYSICAL REVIEW. B, CONDENSED MATTER. - ISSN 0163-1829. - STAMPA. - 37:(1988), pp. 7087-7090. [10.1103/PhysRevB.37.7087]
Phonons at the surface of the nearly-free-electron metal Al(111): realisation of an ideal surface
BORTOLANI, Virginio;SANTORO, Giorgio;FRANCHINI, Anna
1988
Abstract
Surface phonons of the nearly-free-electron metal Al(111) have been measured by high-resolution He-atom time-of-flight experiments for four different directions. This is the first surface which shows no evidence for an anomalous resonant mode found on the noble metals and Pt and attributed to a strong (≊50%) reduction of surface lateral force constants. By fitting the time-of-flight spectra via a lattice-dynamical simulation the surface interlayer force constant is found to agree to within ±3% with the bulk value and the lateral force constant reduction is less than 20%.
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