Radiative Characteristics of Xe2Cl* Molecules under High-Energy Electron Pumping of Xe–CCl4 and Ar–Xe–CCl4 Gas Mixtures with a Low CCl4 Content

Abstract

Spontaneous and stimulated emissions of Xe₂Cl* triplex molecules upon excitation of Xe–CCl₄ gas mixtures with a low CCl₄ 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 Xe₂Cl excimer molecule in the wavelength range of 430–650 nm is shown to consist of 13 narrow vibrational bands with half-widths Δλ ~ 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 ~200 W/cm³ 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 4²Г–1²Г band of a Xe₂Cl* excimer molecule at λ_max = 486 nm was amplified by a factor of 60 in a 100‑cm cell under pumping of a dense ³He–Xe–CCl₄ gas mixture by the ³He(n, p)³T nuclear reaction products at the energy deposition to the gas of ~5 mJ/cm³ in a cavity with the mirror reflections of ~99.4% (totally reflecting mirror) and 98.5% (output mirror).