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Keywords:

  • Confined charges;
  • shell structure;
  • pair correlations;
  • spherical crystal

Abstract

A system of N classical Coulomb charges trapped in a harmonic potential displays shell structure and orientational ordering. The local density profile is well understood from theory, simulation, and experiment. Here, pair correlations are considered for this highly inhomogeneous system for both the fluid and ordered states. In the former, it is noted that there is a close relationship to pair correlations in the uniform one component plasma. For the ordered state, it is shown that the disordered “tiling” is closely related to the ground state Thomson sites for a single sphere (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)