0000000000085525

AUTHOR

F. Garcias

showing 4 related works from this author

Collective excitations of 3He clusters

1991

Collective excitations of3He clusters are studied by treating the cluster as a quantum liquid drop. We have used the Random-Phase Approximation sum rules technique within a Density Functional Formalism. Results forL=2 to 10 surface modes and theL=0 volume mode are presented.

[PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th]Physicsendocrine system[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]Liquid drop02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencesMolecular physicsAtomic and Molecular Physics and Optics010305 fluids & plasmasFormalism (philosophy of mathematics)Quantum mechanics0103 physical sciencesCluster (physics)QuasiparticleAtomic physics010306 general physics0210 nano-technologyQuantumhormones hormone substitutes and hormone antagonists
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The response of metal clusters toq- andL-dependent external fields

1991

We have calculated the static polarizability and mean excitation energy of metal clusters submitted toq-andL-dependent external fields ofjL(qr)YL0(Ω) type. Use has been made of an Extended Random-Phase Approximation which includes exchange and correlation effects within a local model, and of the spherical jellium model to describe the neutralizing positive background.

PhysicsPolarizabilityJelliumAtomic physicsAtomic and Molecular Physics and OpticsExcitationMetal clustersZeitschrift f�r Physik D Atoms, Molecules and Clusters
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Dipole surface plasmon in K+N clusters

1992

Abstract The technique of sum rules has been used to investigate the dipole surface plasmon for K + N clusters within a Density Functional Theory and the spherical jellium model. The role played by non-local effects is discussed comparing the results obtained from different functionals. Band-structure and core-polarization effects have been phenomenologically included in the calculation by means of an electron effective mass and a dielectric constant. Comparison with recent experimental data is presented.

Condensed matter physicsChemistryJelliumSurface plasmonGeneral ChemistryDielectricCondensed Matter PhysicsMolecular physicsSpherical modelDipoleEffective mass (solid-state physics)Materials ChemistryDensity functional theorySum rule in quantum mechanicsSolid State Communications
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Dipole surface plasmon in large K N + clusters

1993

The dipole surface plasmon forK N + clusters is analyzed using the RPA sum-rule technique within a semiclassical Density Functional Theory and the spherical jellium model. The theoretical frequencies are blue shifted as compared to the experimental ones. The discrepancies between theory and experiment are reduced when considering non-local energy contributions in the density functional and phenomenologically including atomic lattice effects by means of an electron effective mass and a static dielectric constant.

PhysicsDipoleEffective mass (solid-state physics)JelliumSurface plasmonPhysics::Atomic and Molecular ClustersSemiclassical physicsDensity functional theoryElectronAtomic physicsAtomic and Molecular Physics and OpticsIonZeitschrift f�r Physik D Atoms, Molecules and Clusters
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