Static Electric Dipole Polarizabilities of Na Clusters

Details Static Electric Dipole Polarizabilities of Na Clusters Static Electric Dipole Polarizabilities of Na Clusters

1999-12-22

arxiv.org/abs/physics/9912045v1

Eur. Phys. J. D 11, 239 (2000).

Physics

Atomic and Molecular Clusters

7 pages, 3 figures, accepted for publication in the European Physical Journal D

Scientific paper

10.1007/s100530070089

The static electric dipole polarizability of $\mathrm{Na_N}$ clusters with even N has been calculated in a collective, axially averaged and a three-dimensional, finite-field approach for $2\le N \le 20$, 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.

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