Cherenkov Radiation in the Visible and Ultraviolet Spectral Ranges from 6-MeV Electrons Passing through a Quartz Plate

Cherenkov radiation and cathodoluminescence in sapphire, quartz, and diamond under the excitation of an electron beam

“…34-36 an increase in the radiation intensity with a decrease in the wavelength was observed in synthetic and natural diamond specimens in the UV spectral range up to 240 nm. Similar results were obtained when an electron beam with a higher electron energy and current density [37][38][39] excited the same specimens. Moreover, CR in the UV spectral range up to 220 nm was observed in leucosapphire and quartz.…”

“…This feature of CR has been used in many works; see, for example, the observation of incoherent CR emitted by a 5.3 GeV positron beam. 43) Experiments carried out with using a 6-MV accelerator 38) have shown that to detect CR, samples should be placed at an angle to the direction of e-beam propagation. Note that in Ref.…”

“…Note that in Ref. 38, when studying the dependence of CR on angle θ, the radiation spectrum of a quartz specimen was also taken; an increase in intensity with a decrease in wavelength was observed.…”

“…With increasing electron energy, the CR intensity increases, 3,13) and it can be detected with ordinary Ocean Optics spectrometers. [37][38][39] In Refs. 34-36 it was shown that to detect CR, it is best to use specimens transparent in the UV range and characterized by the absence or low intensity of cathodoluminescence bands.…”

“…Moreover, CR in the UV spectral range up to 220 nm was observed in leucosapphire and quartz. [37][38][39] As we have already noted, in Ref. 19 only the emission band in the region of 500-700 nm corresponding to cathodoluminescence was observed.…”