The results of investigation of the radiation of a plasma glow discharge constant current on mixtures He / H₂O = 0,5 - 8,0 / 0,05 - 0,15 kPa in a spectral range 130 - 350 nm are presented. We show that, at P(H₂O) = 0,05 - 0,15 kPa and P(He) = 1,0 kPa, the plasma is a source of VUV radiation in the range 130 - 190 nm with maxima at 157, 180, and 186 nm. The increase of the partial pressure of water vapour to 2,0 - 2,5 kPa led to a decrease of the brightness of VUV radiation by 1 - 2 orders, and the band DELTA lambda = 307,0 - 315,0 nm with lambda_max = 309,6 nm becomes main in the spectrum, the appearance of which could be cause by the radiation decay of cluster molecules - (OH)_n^{* .} (H₂O)_m (where: n >= 2 and m >= 1). The optimization of brightness of the radiation of the plasma depending on pressure, composition of the mixture, and size of a discharge current was conducted. The mixture He/H₂O with a low content of water vapour could find its application in the development of an ecologically pure radiator of continuous operation in the range of vacuum ultraviolet.

• Шуаібов Олександр Камілович (фізико-математичні науки)

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