Abstract
The polarization bremsstrahlung of a fast charged particle in a medium is considered for the case where the conditions for two resonances are satisfied simultaneously: the photon frequency is close to the frequency of one of the transitions of the medium atom, and the permittivity of the medium at this frequency meets the conditions of appearance of Cerenkov radiation. As this takes place, the radiation intensity becomes three or four orders of magnitude higher than that associated with the frequency band within which the bremsstrahlung photon energy exceeds the ionization energy of the atom. Estimates are made for an experiment performed on a gas atomic parahelium at frequencies close to that of the 1s-2p transition.
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Krotov, Y.A. Polarization Bremsstrahlung at Atomic and Cerenkov Resonances. Russian Physics Journal 44, 220–225 (2001). https://doi.org/10.1023/A:1011331617096
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DOI: https://doi.org/10.1023/A:1011331617096