On Separation of Minimal Riesz Energy Points on Spheres in Euclidean   Spaces
  For the unit sphere S^d in Euclidean space R^(d+1), we show that for d-1<s<d and any N>1, discrete N-point minimal Riesz s-energy configurations are well separated in the sense that the minimal distance between any pair of distinct points in such a configuration is bounded below by C/N^(1/d), where C is a positive constant depending on s and d. 
A.B.J. Kuijlaars, E.B. Saff, X. Sun