Physical Processes in Barrier Discharge Lamp Working in He/D2O Mixture

This paper presents both results of a numerical modeling and an experimental study of the influence of various parameters on the radiation characteristics of barrier discharge lamp working in He/D2O mixture.It is obtained that the intensity of ultraviolet radiation is a non-monotonic function of both the water and the helium pressures.The experimental results also show that the increase of both the discharge voltage and the discharge pulse frequency leads to the increase of radiation intensity.The comparison between the experimentally obtained data and the results of numerical modeling allows us to define the mechanism controlling the ultraviolet radiation in He/D2O mixture at various parameters.

Optical characteristics of UV-VUV lamps on the electronic-vibrational transitions of the hydroxyl radical pumped by a nanosecond capacitive discharge

This paper presents the results of a study of UV and VUV low-pressure lamp pumped by nanosecond capacitive discharge.This lamp works on the mixtures of helium and argon with water vapor(H_(2)O)or‘heavy’water(D_(2)O).At the capacitive low-pressure lamp emission spectra are mainly narrow band 308 nm OH(A-X)and large band in the VUV spectral range:140-200 nm OH(C,B,A).Found,that the increasing the partial pressure of H_(2)O and D_(2)O(>130-150 Pa)led to a decrease in the intensity of VUV radiation of hydroxyl radicals.In the transition from He/H_(2)O mixture to He/D_(2)O mixture,the optimal pressure of helium is decreased.Reduced partial pressure of argon led to increased intensity of radiation of hydroxyl in the VUV range.The study of emission characteristics of OD^(*)-lamps on a mixture of He/D_(2)O and the OH^(*)-lamps on a mixture of He/H_(2)O showed that the intensity of the bands OD(X,C,A)is 1.5 times larger than the intensity of the bands OH(X,C,A).The maximum absolute intensity of UV-VUV radiation of the lamp(at a frequency of 1000 Hz)reached 1 W.