Abstract
The CO2 decomposition in a DC glow discharge in a sealed-off CO2 laser mixture (6% CO2 : 20% N2 : 74% He) in the pressure range 2 - 22 Torr is investigated. Both the time evolution and the steady-state CO2 decomposition are studied by means of time resolved optical emission spectroscopy. A decrease of the time to reach steady-state values of particles concentrations in the discharge system with decreasing pressure and increasing discharge current is observed. The degree of CO2 decomposition rapidly decreases with increasing pressure and exhibits only a small increase with increasing discharge current. This behaviour can be explained by the variations of the reduced electrica field strength E/N and of the electron density. Also the influence of the balast volume is discussed in this work.
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