Sd. Bosanac, FREQUENCY-SHIFTS IN THE HYDROGEN SPECTRUM DUE TO INTERACTION WITH THEELECTROMAGNETIC-FIELD, Zeitschrift fur Physik. D, Atoms, molecules and clusters, 37(2), 1996, pp. 103-114
Frequency shifts of hydrogen atom spectral lines are analyzed, both fr
om the ''exact'' numerical solutions of the coupled equations and the
perturbation theory. A numerical method for solving the set of the tim
e-dependent equations is described that includes both the bound and th
e continuum states of the hydrogen atom which is stable on a long time
scale.