Cavity ring-down spectroscopy (CRDS) has enabled temporally resolved measurements of the N2+ ion concentration in a pulsed atmospheric pressure nitrogen plasma. A 10 ns voltage pulse is applied to a dc-sustained plasma to change the ionization fraction rapidly. Our measurements show that the pulse increases the N2+ ion concentration from 3.9×1012 to more than 1.5×1013cm -3, and that the N2+ concentration returns to the dc level in about 10 μs. We also determine the electron density by measuring the electrical conductivity of the plasma. Because N2+ is the dominant ion, the good agreement between electrical and CRDS measurements provides validation of the temporally resolved CRDS technique. © 2002 American Institute of Physics.
CITATION STYLE
Yalin, A. P., Zare, R. N., Laux, C. O., & Kruger, C. H. (2002). Temporally resolved cavity ring-down spectroscopy in a pulsed nitrogen plasma. Applied Physics Letters, 81(8), 1408–1410. https://doi.org/10.1063/1.1500427
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