Gamma emission spectra are investigated when excited-state
nuclei in a static magnetic field interact with radio frequency
(RF) radiation fields. The “dressed” state
concept, developed in quantum electronics, is applied to
this situation. The nuclear Zeeman levels are coupled by
means of a quantized RF-radiation field. The total system
consists of the nucleus, the static magnetic field, and
the RF-radiation field. The energy levels and corresponding
eigenstates of the system are calculated as a function
of the frequency of the radiation field and the magnitude
of the RF magnetic flux density. Emission spectra are calculated
for the 57Fe case as a function of the frequency,
the magnitude of the magnetic flux density of the RF-radiation
field, as well as the photon emission direction.