Crystallization of ion clouds in octupole traps: structural transitions, core melting, and scaling laws

Details Crystallization of ion clouds in octupole traps: structural transitions, core melting, and scaling laws Crystallization of ion clouds in octupole traps: structural transitions, core melting, and scaling laws

2009-11-17

arxiv.org/abs/0911.3335v1

Physical Review A: Atomic, Molecular and Optical Physics (2009) a paraitre

Physics

Atomic Physics

Scientific paper

The stable structures and melting properties of ion clouds in isotropic octupole traps are investigated using a combination of semi-analytical and numerical models, with a particular emphasis at finite size scaling effects. Small-size clouds are found to be hollow and arranged in shells corresponding approximately to the solutions of the Thomson problem. The shell structure is lost in clusters containing more than a few thousands of ions, the inner parts of the cloud becoming soft and amorphous. While melting is triggered in the core shells, the melting temperature unexpectedly follows the rule expected for three-dimensional dense particles, with a depression scaling linearly with the inverse radius.

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