Ions trapped in a harmonic potential of the form z^2 + alpha r^2. The number of ions of equals 4, shown as pink spheres. To see other cases, click on :
N=5, N=6, N=7
Two blue squares are placed at z = +-2 to show the z axis. The crystal may be viewed from different angles using the mouse. The buttons and the slider control the value of alpha (eg. alpha=1 => spherical potential well).