Abstract
The population density of metastable Ar 4s′[12]° in a 70% Ar∕30% N2, short-pulsed (<15-ns full width at half maximum) dielectric barrier discharge was determined from the time-resolved diode-laser absorption as a function of pulse repetition rate for a gas pressure of 100Torr. The relative population density change of N2+ BΣu+2 and N2 CΠu3 was also determined from N2+ first negative and N2 second positive plasma emission for the same pulse repetition rates and pressure. The net power deposited per pulse was obtained from measurements of the voltage and current wave forms. The fractional energy dissipated in metastable Ar production was estimated from the power and absorption number density measurements to be roughly 20% for pulse repetition rates ⩽10kHz, decreasing to ∼10% at 30kHz for 3.5-kV applied voltage and 100Torr.
Published Version
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