Wigner molecules are artificial structures created by confining a set of repelling charged particles. Even for small numbers of them, their arrangement can be nontrivial: as an example, six charges on a disk tend to form a pentagon with the sixth particle at the center, and the situation gets only more complicated for higher numbers of particles or in three dimensions. CocoaWm is a freeware explorer of such structures for MacOs 10.5 or later. It allows to obtain stable 2D and 3D Wigner molecules and to study their normal modes of vibration. In addition, by virtue of a simple molecular dynamics engine, it is possible to observe the effects of scattering a fast charge on the molecule.
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