Diagnostics of Optical Characteristics and Parameters of Gas-Discharge Plasma Based on Mercury Diiodide and Helium Mixture

Abstract

The results of diagnostics of spectral, temporal and energy characteristics of the radiation of gas-discharge plasma in a mixture of mercury diiodide vapor with helium in the spectral range of 350-900 nm, and the plasma parameters in the range of reduced electric field E/N = 1-100 Td are presented. The plasma is created in the barrier discharge device with a cylindrical aperture. The electrodes are placed 0.2 m in length at a distance of 0.015 m. The amplitude of the pump pulse, the duration and frequency were 20-30 kV, 150 ns and 1-20 kHz, respectively. Radiation in the visible region of the spectrum of mercury monoiodide exciplex molecule is revealed. Regularities in the optical characteristics of the plasma, depending on the partial pressures of the components of the mixture, the electron energy distribution function, mean electron energy, specific losses of discharge power on the process of dissociative excitation of mercury monoiodide (state 2 1 2 В + Σ) molecules as well as the rate constant of dissociative excitation of mercury monoiodide molecules in working mixture depending on the given reduced electric field are established.

Optical characteristics of the two-band barrier discharge excilamp on mercury monoiodide and mercury monobromide molecules

“…Важливим напрямком в розробки ексиламп є дослідження робочих середовищ, що випромінюють одночасно декілька молекулярних смуг різних ексиплексних молекул і або ексимерних молекул у видимому і ультрафіолетовому спектральних діапазонах. Багатосмугове випромінювання було здобуто в умовах тліючого розряду низького тиску, а також в бар'єрному розряді [1][2][3][4].…”

Optical Emission of Atmospheric - Pressure Dielectric Barrier Discharge Plasma on Mercury Diiodide/Rare Gases Mixtures

“…= 441.4, 443, 444, 445 nm [4][5][6][7][8][9][10][11][12]. Exciplex radiators (lasers and excilamps) that work on such mixtures provide high spectral radiation power that is important for practical applications in plant photoregulation, biotechnology and medicine.…”

“…Exciplex radiators (lasers and excilamps) that work on such mixtures provide high spectral radiation power that is important for practical applications in plant photoregulation, biotechnology and medicine. [13][14].Optical emission of gaseous mixtures, including mercury diiodidevapor, inert gases, molecular nitrogen was studied in [4][5][6][7][8][9][10][11]. Atmospheric pressure plasma in the working mixtures was produced in a glow and barrier discharges under repetitively pulsed or sinusoidalvoltage form.…”

Mechanism of Growth of the Intensity of Radiation Emitted in the Blue-Violet Spectral Interval by Gas-Discharge Plasma Generated in the Mixtures of Mercury Diiodide Vapor, Xenon, and Neon

“…Gas-discharge plasma generated in the mixtures of mercury diiodide vapor with various gases is a working medium of exciplex sources of coherent and spontaneous radiation (lasers and excilamps) in the blueviolet spectral interval, with the corresponding intensity maxima being located at the wavelengths = 441.4, 443, 444, and 445 nm [1][2][3][4][5][6][7]. Those sources can be used in scientific researches, photonics, biotechnology, medicine, in the manufacture of gas-discharge display panels, as well as to provide an effective lightassisted control over the processes of photosynthesis, plant growth and development, and phytocenosis [8][9][10][11][12][13].…”