Nils Berglund, Turgay Uzer
The averaged dynamics of the hydrogen atom 
in crossed electric and magnetic fields 
as a perturbed Kepler problem
(624K, LaTeX 2e, 13 PS Figures)

ABSTRACT.  We treat the classical dynamics of the hydrogen atom in 
perpendicular electric and magnetic fields as a celestial mechanics 
problem. By expressing the Hamiltonian in appropriate action-angle 
variables, we separate the different time scales of the motion. 
The method of averaging then allows us to reduce the system to 
two degrees of freedom, and to classify the most important 
periodic orbits.