Figure 3.

Gray scale plots of the two-body density for the two-electron ground state at zero magnetic field with (a) R/aB = 0.01, (b) 0.1, (c) 1, and (d) 10. One electron is fixed at the point indicated by a circle.

Okuyama et al. Nanoscale Research Letters 2011 6:351   doi:10.1186/1556-276X-6-351
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