Optical characteristics and parameters of gas-discharge plasma in a mixture of mercury dibromide vapor with neon
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Optical Characteristics and Parameters of GasDischarge Plasma in a Mixture of Mercury Dibromide Vapor with Neon A. A. Malinina and A. N. Malinin Uzhhorod National University, pl. Narodna 3, Uzhhorod, 88000 Ukraine email: [email protected] Received February 7, 2013; in final form, May 22, 2013
Abstract—Results are presented from studies of the optical characteristics and parameters of plasma of a dielectric barrier discharge in a mixture of mercury dibromide vapor with neon—the working medium of a noncoaxial exciplex gasdischarge emitter. The electron energy distribution function, the transport charac teristics, the specific power losses for electron processes, the electron density and temperature, and the rate constants for the processes of elastic and inelastic electron scattering by the working mixture components are determined as functions of the reduced electric field. The rate constant of the process leading to the formation of exciplex mercury monobromide molecules is found to be 1.6 × 10–14 m3/s for a reduced electric field of E/N = 15 Td, at which the maximum emission intensity in the blue–green spectral region (λmax = 502 nm) was observed in this experiment. DOI: 10.1134/S1063780X13120052
1. INTRODUCTION Gasdischarge plasma in a mixture of mercury dibromide (HgBr2) vapor with various gases serves as the working medium of sources of coherent and spon taneous emission in the blue–green spectral region with the maximum intensity at λmax = 502 nm [1–15]. Gasdischarge plasmas were produced and the com ponents of the working mixture were excited under atmospheric pressure in bulk, glow, dielectric barrier, and surface discharges. The optical characteristics of such plasmas were studied in emitters with working volumes of ≥200 × 10 −6 and ~1 × 10 −6 m3 [16–19]. Such volumes are necessary to create high and low power blue–green emitters intended to solve various scientific and applied problems [20, 21]. In sources of spontaneous emission, helium is mainly used as a buffer gas. Such sources have a coaxial design, and their side surface serves as an emitting zone. In a num ber of scientific and technological applications, it is necessary to provide a high density and high unifor mity of emission over the emitter cross section. The use of working mixtures with buffer gases that are heavier than helium and have a lower penetrability through the emitter walls makes it possible to increase the emitter service lifetime [19]. This work is aimed at studying the optical charac teristics of gasdischarge plasma in a mixture of mer cury dibromide vapor with neon and determining the partial pressure of neon at which the maximum emis sion intensity of a noncoaxial emitter in the blue– green spectral region is achieved. The goal of this work was also to determine the parameters of the emitter plasma (the electron energy distribution function
(EEDF), the transport and energy characteristics, the discharge power losses for electron processes, the elec tron density and temperature, and t
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