How Metallic are Small Sodium Clusters?

Details How Metallic are Small Sodium Clusters? How Metallic are Small Sodium Clusters?

2010-10-25

arxiv.org/abs/1010.5114v2

Phys. Rev. Lett. 106 043401 (2011)

Physics

Atomic and Molecular Clusters

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.106.043401

Cryogenic cluster beam experiments have provided crucial insights into the evolution of the metallic state from the atom to the bulk. Surprisingly, one of the most fundamental metallic properties, the ability of a metal to efficiently screen electric fields, is still poorly understood in small clusters. Theory has predicted that many small Na clusters are unable to screen charge inhomogeneities and thus have permanent dipole moments. High precision electric deflection experiments on cryogenically cooled Na$_N$ ($N<200$) clusters show that the electric dipole moments are at least an order of magnitude smaller than predicted, and are consistent with zero, as expected for a metal. The polarizabilities of Na clusters also show metal spheroid behavior, with fine size oscillations caused by the shell structure.

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