Perturbation of the ns energy levels of the hydrogen atom in   rotationally invariant noncommutative space
  Noncommutative space which is rotationally invariant is considered. The hydrogen atom is studied in this space. We exactly find the leading term in the asymptotic expansion of the corrections to the $ns$ energy levels over the small parameter of noncommutativity. 
Kh. P. Gnatenko, Yu. S. Krynytskyi, V. M. Tkachuk
quant-ph hep-th