Diamagnetism of the Hydrogen Atom in the Quasi-Landau-Regime

Since the discovery of quasi-Landau resonances by Garton and Tomkins [1] the physics of highly excited atoms in static homogenous magnetic fields has attracted much attention [2]. Substantial progress particularly with the hydrogen atom has been achieved in recent years by theoretical [3–11] and experimental [10–14] work. The interest in atomic diamagnetism arises from the fact that even for the hydrogen atom with its purely Coulombic field the Schrbodinger equation is nonseparable in any coordinate system.