Static electric dipole polarizabilities of Na clusters
Institute for Theoretical Physics, University of Regensburg,
93040 Regensburg, Germany
2 Institute for Theoretical Physics, University of Erlangen, 91077 Erlangen, Germany
Published online: 15 August 2000
The static electric dipole polarizability of clusters with even N has been calculated in a collective, axially averaged and a three-dimensional, finite-field approach for , including the ionic structure of the clusters. The validity of a collective model for the static response of small systems is demonstrated. Our density functional calculations verify the trends and fine structure seen in a recent experiment. A pseudopotential that reproduces the experimental bulk bond length and atomic energy levels leads to a substantial increase in the calculated polarizabilities, in better agreement with experiment. We relate remaining differences in the magnitude of the theoretical and experimental polarizabilities to the finite temperature present in the experiments.
PACS: 36.40.-c – Atomic and molecular clusters / 31.15.Ew – Density-functional theory / 33.15.Kr – Electric and magnetic moments (and derivatives), polarizability, and magnetic susceptibility
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000