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Expressions for energy and angular momentum changes of the hydrogen atom dueto interaction with the electromagnetic field during the period of the electronmotion in the Coulomb field are derived. It is shown that only the energychange for the motion between two subsequent passings of the pericenter isrelated to the quasiclassical dipole matrix element for transitions betweenexcited states.

Interaction and chaotic dynamics of the classical hydrogen atom in an electromagnetic field