Spectroscopic diagnostics of a high-frequency dielectric barrier discharge of atmospheric pressure in mixtures of cadmium diiodide vapor with neon and small additions of xenon

Antonina Malinina

doi:10.31281/jtsp.v1i1.14

Abstract

Diagnostics of the emission spectra of a gas-discharge plasma of a barrier discharge of atmospheric pressure in mixtures of cadmium diiodide vapor with neon and small additions of xenon is carried out. A gas-discharge plasma was created and the components of the working mixture were excited by a high-frequency barrier discharge at a sinusoidal voltage pulse repetition rate of up to 140 kHz. Emission of exciplex molecules of cadmium monoiodide with a maximum emission at a wavelength of λ = 655 nm and xenon iodide with a maximum of radiation at wavelengths λ = 253 and λ = 320 nm, excimer molecules of iodine, lines of atoms of cadmium, iodine, neon and xenon was revealed. It was found that at temperatures of the mixtures under study above 150 0C, the predominance of radiation from exciplex molecules of cadmium monoiodide is observed. The reason for the increased brightness of the emission of exciplex molecules of cadmium monoiodide in mixtures of cadmium diiodide vapor with neon and xenon additive is established. The regularities in the spectral characteristics of radiation in the mixtures under study are discussed. A high-frequency barrier discharge of atmospheric pressure in mixtures of cadmium diiodide vapor with neon and xenon is of interest for creating a multi-wavelength excilamp in the UV and visible spectral ranges

Highlights

Diagnostics of plasma radiation spectra is an important tool for studying physicochemical processes occurring in plasma in spontaneous and coherent radiation sources
Plasma based on mixtures of cadmium diiodide vapor with inert gases is being investigated in order to create a highly efficient coherent and spontaneous source of selective radiation of exciplex cadmium monoiodide molecules in the red spectral range [2,3,4]
Vol 1, Issue 1 - 45 with xenon and neon at amospheric pressure, the conditions were revealed under which the excitation and emission of simultaneously exciplex molecules of cadmium monoiodide (CdI *) and xenon iodine (XeI *) with a wavelength at the maximum radiation intensity λmax . = 650 nm and λmax. = 253 nm, is occurred [5]

Summary

Introduction

Diagnostics of plasma radiation spectra is an important tool for studying physicochemical processes occurring in plasma in spontaneous and coherent radiation sources. Plasma based on mixtures of cadmium diiodide vapor with inert gases is being investigated in order to create a highly efficient coherent and spontaneous source of selective radiation of exciplex cadmium monoiodide molecules in the red spectral range [2,3,4]. The purpose of the research was to diagnose the emission spectra of gas-discharge plasma in mixtures of cadmium diiodide vapor with neon and xenon with the excitation of working gas mixtures by a high-frequency power source with a harmonic output voltage, with the possibility of frequency tuning up to 140 kHz, to determine the plasma parameters and, on the basis of them, to establish the reduced electric field at which the maximum contribution of the discharge power to the excitation of exciplex molecules of cadmium monoiodide and xenon iodide will be observed

Objectives

Results

Conclusion