Surface collective oscillations of metal clusters and spheres: Random-phase-approximation sum-rules approach
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Serra, Llorenç; Garcias Gomila, Francesca; Barranco, Manuel; Navarro, Jesús; Balbás Ruesgas, Luis Carlos; Mañanes Pérez, Ángel
Date
1989-04-15Derechos
© 1989 The American Physical Society
Publicado en
Physical review. B, Condensed Matter, vol 39, N,m 12, pag. 8247-8256, 1989
Publisher
American Physical Society
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Abstract:
Using the once and thrice energy-weighted moments of the random-phase-approximation
strength function, we have derived compact expressions for the average energy of surface collective
oscillations of clusters and spheres of metal atoms. The L =0 volume mode has also been studied.
We have carried out quantal and semiclassical calculations for Na and Ag systems in the sphericaljellium
approximation. We present a rather thorough discussion of surface diffuseness and quantal
size effects on the resonance energies.
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