STUDY OF THE LUMINESCENCE OF CHALCOGENES IN A GAS DISCHARGE

Relatively little-studied gas discharge sources of low-temperature plasma based on vapors of some chalcogens, in particular sulfur, selenium, and tellurium, are attracting more and more attention of scientists, since they are quite common in nature and have a significant range of practical applications.

In more detail, the main nodes, the "Plasma" experimental setup itself, and the measurement technique can be described as follows. The gas discharge was excited using a thyratron generator with a TGI1-2000/35 commutator and resonant recharging of a storage capacity of 1650 pF. The high-voltage pulsed power supply unit used in the studies provided a pulse voltage of up to 10 kV, a pulse repetition frequency of no more than 10 kHz, an average discharge current of up to 1 A, and a maximum power deposited in the plasma of up to 2.5 kW. Time-integrated emission characteristics of gas discharges were recorded using a spectrometer built on the basis of the MS 7504i spectral monochromator. The spectrometric complex also included two detectors of optical radiation: the HS 101H CCD line and the R928 photomultiplier. The MS 7504i monochromator is manufactured and designed by SOLAR TII according to the horizontal Czerny-Turner optical scheme with astigmatism compensation. This optical scheme avoids repeated reflection of radiation from diffraction gratings. The spectral composition of the resulting gas-discharge plasma radiation in the wavelength range of 200–1000 nm was investigated. For creating working mixtures based on chalcogen vapors (emitting species - chalcogen molecules, B→X electronic transition) argon or helium at pressures that did not exceed atmospheric pressure were used as buffer gases.