The role of radiation fluctuations in the suppression of periodic "surge-like" returns of a system to the ground state with excitation from it into a band of discrete levels is studied. It is shown that the suppression is determined by the ratio of the width of the radiation line to the width of the excitation region into the band. With slow frequency fluctuations the suppression may be weakened, while with resonance on the edge of the band and amplitude fluctuations it, on the contrary, rises sharply.
Research Institute of Nuclear Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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