Abstract
Experiments were performed to generate water vapor plasma in a microwave discharge using a household magnetron (frequency 2.45 GHz). Plasma was ignited in a discharge tube during evaporation from the vessel, and also at the liquid-gas interface. The input power ranged from 1 to 2 kW, and the vapor pressure ranged from 1 to 10 mbar. The time dependence of the emission intensity for the first three lines of the Balmer series of hydrogen was constructed. It was revealed that the time required to heat the plasma to a steady state was 2 ms. A change in the anode current by 15% did not lead to an appreciable change in plasma emission intensity. The plasma temperature estimated using the Boltzmann method was about 4000 K. The plasma was shown not to be in thermodynamic equilibrium.
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