ROTATIONAL TEMPERATURE MEASUREMENTS OF AN OPTICALY PUMPED, VIBRATIONALLY EXCITED CARBON MONOXIDE-ARGON PLASMA USING SINGLE PHOTON LASER INDUCED FLUORESCENCE OF THE $(\nu^{\prime\prime}=20)X^{1}\Sigma^{+}\leftarrow(\nu^{\prime}=2) D^{1}\Sigma^{+}$ BAND
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Date
2000
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Ohio State University
Abstract
A tunable, injection-locked ArF excimer laser been used to obtain single photon laser induced fluorescence spectra from a highly vibrationally excited (up to $\nu^{\prime\prime} \approx 40$), nonequilibrium CO/Ar plasma. The combination of broadband emission and rotationally resolved narrowband scanning excitation spectra has been used to determine that the fluorescence signal is due to the resonant excitation between the $\nu^{\prime\prime}=20$ level of the $X^{1}\Sigma^{+}$ state and the $\nu^{\prime}=2$ level of the $D^{\prime1}\Sigma^{+} {^{a,b}}$. This spectroscopic data suggests that with appropriate care to avoid extraneous multi-photon chemical $processes^{c}$, the $D^{\prime}\rightarrow $X fluorescence may be used as a rotational temperature diagnostic as long as the $CO \nu^{\prime\prime}=20$ vibrational state is sufficiently populated.
Description
$^{a}$ D.M Cooper and S.R. Langhoff, J. Chem. Phys. 74, p. 1200, 1981. $^{b}$ G.L. Wolk and J.W. Rich. J. Chem. Phys. 79, p. 12, 1983. $^{c}$ G. Meijer, A.M. Wodtke, et al, J. Chem. Phys. 89, p. 2588, 1988.
Author Institution: Department of Mechanical Engineering and Department of Chemistry, Nonequilibrium Thermodynamics Laboratory, The Ohio State University
Author Institution: Department of Mechanical Engineering and Department of Chemistry, Nonequilibrium Thermodynamics Laboratory, The Ohio State University