Abstract
The spectral and power characteristics of radiation of the second positive system of nitrogen (C3Πu → B3Πg) in Ar-N2 and Ar-N2-Cl2 mixtures excited by barrier discharge have been studied experimentally. Addition of argon to N2 increased the radiation power by sixfold. In the triple mixture Ar-N2-Cl2 = 210/0.5/0.005, minor chlorine additions increased the intensity of the C3Πu → B3Πg transition by 26% compared to Ar-N2 mixtures. Radiation power density of 2.7 mW/cm2 has been achieved. In both binary and triple mixtures, the second positive system of nitrogen was the major contributor to radiation, while the contributions of the fourth positive system of N2* (D3Σu+ → B3Πg), the Vegard-Kaplan transition of N2* (A3Σu+ → X1Σg+), and the D′ → A′ band of Cl2* were negligibly small.
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