Cherenkov radiation and cathodoluminescence in diamond under the action of electrons with an energy of 5.7 MeV

The spectral and kinetic characteristics of the radiation of diamond samples with different impurity-defect compositions under the action of electrons with an energy of 5.7 MeV have been studied. Cherenkov radiation was obtained in all studied samples. A difference has been established in the radiation spectra of nominally pure samples obtained by different synthesis methods. A diamond sample has been determined that is suitable for registration of Cherenkov radiation in a wide spectral range (UV and visible) under conditions of low beam current density (tens of nA/cm$^2$).