Measurement of CH density in a pulsed-dc hydrocarbon-gas- mixture discharge

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公開日
2005-05-03
DOI
  • 10.1063/1.1891276
公開者
AIP Publishing

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<jats:p>Optical and electrical measurements are performed in methane/diluent mixtures in a 250-ns pulsed-dc discharge using a fast-rise-time pulser. In particular, emission and laser-induced-fluorescence studies of CH produced by direct-electron-impact dissociation reveal the postdissociation kinetics of CH as well as a means of estimating the CH density. In a 20-Torr 10%∕20%∕70% mixture of argon/methane/nitrogen, the instantaneous CH density is determined to be 2.1×1013cm−3 at the end of the steady-state voltage and current condition. Kinetics analysis reveals that neutral chemistry with methane is the largest loss process for the CH fragments. Analysis of N2(C-B) rotational temperatures indicates that less than 30% of the input electrical energy is deposited as heat in the gas, with the balance going toward dissociation, excitation of internal molecular states, and ionization.</jats:p>

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