Radiative characteristics of Xe$_{2}$Cl$^{*}$ molecules under high-energy electron pumping of Xe–CCl$_{4}$ and Ar–Xe–CCl$_{4}$ gas mixtures with a low CCl$_4$ content

Spontaneous and stimulated emissions of Xe$_{2}$Cl$^{*}$ triplex molecules upon excitation of Xe–CCl$_4$ gas mixtures with a low CCl$_4$ content by a pulsed high-energy electron beam have been experimentally studied. The electron energy is 150 keV, and the pump current pulse duration and amplitude are 5 ns and 5 A, respectively. Emission of an Xe$_2$Cl excimer molecule in the wavelength range of 430–650 nm is shown to consist of 13 narrow vibrational bands with half-widths $\Delta\lambda\sim$14 nm peaking at 399, 413, 431, 451, 472, 492, 510.3, 534.9, 540.9, 551.7, 564.4, 581.6, and 603 nm. Under the given pumping conditions, a regime of weakly amplified spontaneous emission is implemented at the energy deposition to the gas of $\sim$200 W/cm$^3$ on the axis of a 50-mm cell and the electron beam pumping in the wavelength range of 450–550 nm. Spontaneous emission of the 4$^{2}\Gamma$–1$^{2}\Gamma$ band of a Xe$_{2}$Cl$^{*}$ excimer molecule at $\lambda_{\operatorname{max}}$ = 486 nm was amplified by a factor of 60 in a 100-cm cell under pumping of a dense $^3$He–Xe–CCl$_4$ gas mixture by the $^{3}$Не$(n,p)^{3}$T nuclear reaction products at the energy deposition to the gas of $\sim$5 mJ/cm$^3$ in a cavity with the mirror reflections of $\sim$99.4% (totally reflecting mirror) and 98.5% (output mirror).