Abstract
The author investigates the classical centre of mass motion of the positronium atom in a homogeneous magnetic field. For the case of vanishing pseudomomentum and angular momentum component along the magnetic field axis the centre of mass moves on a straight line. Its behaviour changes drastically from, for example, quasiperiodic oscillations to random fluctuations if the internal motion changes from regularity to chaos. The author shows that the one-dimensional spreading of an ensemble of trajectories obeys a linear diffusion law. Some particularly interesting examples of the centre of mass motion for Lz not=0 are also discussed.
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