The electron number density of argon-oxygen atmospheric pressure plasma

The studied plasma source was a wall stabilized directcurrent arc burning in argon at atmospheric pressure, originally designed for elemental spectrochemical analysis.The influence of oxygenaddition (1 -20 %) on the electron density of mixed gas plasmawas investigated for two initial plasma compositions, i.e.argon gas with water aerosol and and argon with water aerosol containing 0.5 % KCl. The electron number densitieswerecalculated from themeasured Stark profiles of Hβspectral line. The results have shown that the addition of oxygenhas weak influence on electron number density in the studied central plasma zones. Similar trends were observed regardless of the presence or absence of easily ionized element (potassium).Physical chemistry 2016 : 13th international conference on fundamental and applied aspects of physical chemistry; Belgrade (Serbia); 26-30 September 2016