Plasmon response in K, Na and Li clusters: systematics using the separable random-phase-approximation with pseudo-Hamiltonians |
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Authors: | W Kleinig VO Nesterenko P-G Reinhard Ll Serra |
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Institution: | Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia, RU Institut für Theoretische Physik, Universit?t Erlangen, Staudtstrasse 7, 91058 Erlangen, Germany, DE Departament de Física Universitat de les Illes Balears, 07071 Palma de Mallorca, Spain, ES
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Abstract: | The systematics of the plasmon response in spherical K, Na and Li clusters in a wide size region is studied. Two simplifying approximations whose validity has been established previously are considered: (a) a separable
approach to the random-phase-approximation, involving an expansion of the residual interaction into a sum of separable terms,
(b) the electron-ion interaction is modeled within the pseudo-Hamiltonian jellium model (PHJM) including nonlocal effects
by means of realistic atomic pseudoHamiltonians. In cases where nonlocal effects turn out to be negligible, the Structure
Averaged Jellium Model (SAJM) has been used. The leading role of Landau damping in forming the plasmon width in medium and
large clusters is demonstrated. Good agreement with available experimental data is achieved for K, Na (using the SAJM) and
small Li clusters (invoking the PHJM). The trends for peak position and width are generally well reproduced, even up to details
of the Landau fragmentation in several clusters. Less good agreement, however, is found for large Li clusters. The possible
reasons of the discrepancy are discussed.
Received: 22 April 1998 / Accepted: 24 July 1998 |
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Keywords: | PACS 36 40 Cg Electronic and magnetic properties of clusters - 36 40 Gk Plasma and collective effects in clusters - 36 40 Vz Optical properties of clusters - 36 40 Wa Charged clusters |
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