The Corona-discharge of Liquid and Gaseous Helium in Cryo-plasma

The use of a highly divergent field distribution (i.e. corona discharge or micro discharge) is essential in order to analyse different breakdown stages. In our work, we have measured the emission spectra and specially, the pressure broadening and shift of atomic lines and molecular bands. The experiments for point electrode (both negative and positive corona discharge) have been carried out at constant temperatures, for gas at 300K; 150K; 10K; 6K and liquid at 4,2K; 5,1K in a wide range of pressure. The results obtained for pressure in the range 4,5-300 K will show the significant influence of pressure and perturber density on these phenomena