Electron-phonon coupling and anharmonic effects in metal clustersF. F. Karpeshin1, 2, J. da Providência1, C. Providência1 and J. da Providência jr.3
1 Departamento de Física, Universidade de Coimbra - 3004-516 Coimbra, Portugal
2 Institute of Physics, St. Petersburg University - 198904 St. Petersburg, Russia
3 Departamento de Física, Universidade da Beira Interior - 6201-001 Covilhã, Portugal
(Received 18 March 2004; accepted in final form 25 June 2004)
The periods of the harmonic oscillations of the ion core of charged sodium clusters around the equilibrium shapes are considered. It is found that these periods are of the order of magnitude of the experimentally measured relaxation times of the plasmons, which suggests the importance of the electron-ion coupling and stresses the role played by the electron-phonon interaction in the dissipation of the plasmon energy. The relation of the process to fission is briefly discussed.
36.40.-c - Atomic and molecular clusters.
36.40.Gk - Plasma and collective effects in clusters.
36.40.Qv - Stability and fragmentation of clusters.
© EDP Sciences 2004