Cathodoluminescence of Nitrogen-Containing Diamond Samples at Temperatures of 80–800 K

Cherenkov radiation in low-impurity diamond samples under the action of an electron beam with an energy of tens-hundreds of keV

“…Thus, despite the fact that almost all electrons in the beam had an electron energy exceeding the threshold energy for the occurrence of CR in diamond (Figure 2a), CR in the emission spectra was observed only at a higher beam current density, as in [4,5]. It was also shown in [4,5] that exciton luminescence experiences strong quenching with increasing temperature, and is not observed in the emission spectra at temperatures above ~650 K. Therefore, these diamond samples can be used in Cherenkov detectors as a radiator material at temperatures above 650 K. Sample No. 1 can be used as a radiator for a Cherenkov detector at room temperature, but only at low beam current densities, at which exciton luminescence in the emission spectra does not appear.…”

“…Exciton luminescence was observed in the emission spectra of nominally pure samples, which experienced strong temperature quenching with increasing sample temperature. However, Cherenkov radiation was not detected in the luminescence spectra of these samples in [4,5] even at high temperatures in the absence of exciton luminescence. In this case, almost all electrons in the beam had an energy exceeding the threshold for the occurrence of CR in diamond.…”

“…*bag@loi.hcei.tsc.ru; The radiation of diamond samples was excited using an electron beam from a NORA generator with a sealed IMA3-150E electron tube [4,5]. Radiation studies were carried out at different beam current densities.…”

“…Therefore, a relatively pure diamond sample, in which there is no exciton luminescence, is best suited for recording CR. Previously, in [4,5], the radiation of diamond samples with various impurity-defect compositions, including nominally pure ones, was studied when excited by an electron beam with an energy of tens to hundreds of keV. Exciton luminescence was observed in the emission spectra of nominally pure samples, which experienced strong temperature quenching with increasing sample temperature.…”