Data on the fluctuations in cosmic microwave background (CMB) radiation, whose accuracy
is expected to increase in the immediate future, allow the cosmological recombination of atomic hydrogen
and its interaction with the CMB radiation to be studied. Nonresonant effects play an important role in
these recombination processes. We consider the quantum-mechanical foundations of the nonresonant
processes and present our calculations for the differential two-photon decay rates of the 3s and 3d levels in
the hydrogen atom.

EB00000003815K

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• Nonresonant Effects and Hydrogen Transition Line Shape in Cosmological Recombination Problems 1