Spectral Characteristics of the Barrier Discharge on Mercury Diiodide Vapor with Neon Mixture

Aims: To investigate spectral characteristics of a high-frequency barrier discharge plasma of atmospheric pressure on mercury diiodide vapor with neon mixture.

Study Design: A small cylindrical radiator with a single dielectric barrier of capacitance Cd = 40 pF made of a quartz tube was used for the experiments. Inside along the axis there was a molybdenum electrode with a diameter 1 mm, an external electrode 30 mm in length was made of a mesh with a transmittance 70%.

Place and Duration of Study: Department of Quantum electronics, Faculty of Physics, Uzhhorod National University, between June 2017 and September 2017.

Methodology: The high-voltage generator with an average power of up to 100 W was used to apply sinusoidal voltage (up to 7 kV and 130 kHz) to the electrodes of the radiator. The radiation spectra were recorded using a Jobin Yvon TRIAX 550 spectrometer (1200 lines / mm and 3600 lines / mm, a slit 0.02 mm, a quartz optical fiber and a Spectrum ONE CCD detector cooled with liquid nitrogen.

Results: Intense quasicontinuous emission of spectral bands with a maximum at λ = 443 nm and 306 nm, as well as 342 nm of exciplex molecules mercury monoiodide and iodide molecules have been revealed. The main part of the emission of spectral bands is concentrated in violet-blue spectral region, namely, 439-446 nm, the relative brightness of which is higher than the brightness of other spectral bands and lines.

Conclusion: The gas discharge excilamp at high pumping frequencies on mercury diiodide with neon mixture can be created with operating life higher than the excilamp, where the buffer gas is used helium.