Abstract

Purpose. To investigate the optical characteristics and parameters of the barrier discharge plasma on mixtures of cadmium diiodide vapor and helium with small molecular nitrogen additives at high pump pulse frequencies.
Methods. The creation of a gas-discharge plasma and the excitation of the components of the working mixture were carried out by a pulse-periodic (pulse repetition rate of 18–20 kHz, pulse duration 150 ns) barrier discharge. Barrier discharge plasma parameters were determined numerically based on the electron energy distribution function (EEDF) in discharge. EEDF was determined by solving the kinetic Boltzmann equation in two-terms approximation using the well-known program «Bolsig+». Based on EEDF: mean electron energies, electron mobility, specific power losses of electrical discharge and rate constants of elastic and inelastic scattering of electrons on cadmium diiodide, helium and molecular nitrogen as a function of the reduced electric field were identified.
Results. Emission in the visible spectrum of cadmium monoiodide exciplex molecules and cadmium atoms was detected. The regularities in the changes in the optical characteristics of the plasma are established depending on the repetition rate of the pump pulses, the component and the quantitative composition of the mixtures. Discussions of research results are presented. The research data is of interest for creating exciplex gas-discharge sources of visible radiation with a radiation maximum at a wavelength of λ=650 nm.
Conclusions. A gas-discharge barrier discharge plasma on mixtures of cadmium diiodide vapor, helium, and molecular nitrogen is of interest for creating exciplex gas-discharge sources of visible radiation with a radiation maximum at a wavelength of λ=650 nm, which will be used in biotechnology, agrophysics, scientific researches in quantum electronics, for pumping solid-state and liquid lasers and in medicine

Keywords: gas-discharge exciplex radiation sources, halogen-containing molecules, cadmium monoiodide, visible spectral range, barrier discharge

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