Parametric x-ray radiation and coherent bremsstrahlung from nonrelativistic electrons in crystals

A theoretical analysis of radiation spectra produced during the coherent in teraction of nonrelativistic electrons with crystals has been carried out. The output intensity has been found to be the result of interference betwee n two distinguishable phenomena, coherent Bremsstrahlung and parametric x-r ay radiation. The latter is determined by a coherent summation of transitio n radiation from electrons interacting with successive crystallographic pla nes. The interference is shown to be considerable for the case of nonrelati vistic electrons, and so allows us to describe quantitatively the experimen ts of Korobochko et al. (Zh. Eksp. Teor. Fit. 48, 1248 (1965) [Sov. Phys. J ETP 21, 834 (1965)]) and Reese et al. [Philos. Mag. A 49, 697 (1984)]. The conditions for possible application of coherent x-ray radiation, a comparis on with synchrotron radiation, and the requirements for experimental setup are discussed.