The quantum behavior of a hydrogen atom (with m=0) in a uniform magnetic field is mapped onto an asymmetric top. This mapping, in conjunction with the idea of a rotational energy surface, provides a physical interpretation for the observed electronic structure and quantum numbers, and gives an explanation for the localization of Rydberg states in a magnetic field.

• Received 10 April 1990

DOI:https://doi.org/10.1103/PhysRevA.42.5787