KEPLER ORBITS FOLLOWED BY HYDROGEN ATOMS IN COHERENT STATES
氢原子在相干态下的Kepler轨道

Transforming the Coulomb problem to harmonic osillator, we construct nonspreading coherent states for the 2D and 3D hydrogen atom and show that the expectation values of the observables in Q. M. follow the classical Kepler orbits in physical space. The use of a fictitious time variable in the associated auxiliary osillator problem plays a crucial role.