H\'enon-Heiles Interaction for Hydrogen Atom in Phase Space
  Using elements of symmetry, as gauge invariance, several aspects of a Schr\"odinger equation represented in phase-space are introduced and analyzed under physical basis. The Hydrogen atom is explored in the same context. Then we add a H\'enon-Heiles potential to the Hydrogen atom in order to explore chaotic features. 
J.S. da Cruz Filho, R.G.G. Amorim, S.C. Ulhoa, F.C. Khanna, A. E.   Santana and J.D.M. Vianna
quant-ph math-ph math.MP physics.atom-ph