Phys. Rev. B 60, R2197–R2199 (1999)Anharmonicity of the dipole resonance of metal clusters
We discuss the degree of anharmonicity of dipole plasmon resonances in metal clusters. We employ the time-dependent variational principle and show that the relative shift of the second phonon scales as N-4/3 in energy, N being the number of particles. This scaling property coincides with that for nuclear giant resonances. Contrary to the previous study based on the boson-expansion method, the deviation from the harmonic limit is found to be almost negligible for Na clusters, the result being consistent with the recent experimental observation. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.60.R2197
DOI:
10.1103/PhysRevB.60.R2197
PACS:
36.40.Vz, 36.40.Gk, 21.60.Jz
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