CO/He GLOW DISCHARGE TEMPERATURE MEASUREMENTS USING CO 4th POSITIVE BAND LIF
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Date
2002
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Ohio State University
Abstract
Single-photon Laser Induced Fluorescence has been used to measure the trans-rotational temperature of mildly vibrationally excited carbon monoxide ($v^{\prime\prime} \leq 9$) within the positive column of a CO/He normal d.c. glow $discharge.^{a}$ A tunable, narrowband ArF excimer laser at 193nm was used to pump the strongly allowed $CO X^{1}\sum^{+}(v^{\prime\prime}=7)\rightarrow A^{1}\Pi(v^{\prime} =1)$ transition with subsequent collection of the 200.8nm (1,8) $4^{th}$ Positive $emission.^{b}$ The resulting rotational spectral peaks were assigned and a subset was used to estimate the rotational temperature to be $432 \pm 72K (3\sigma)$. Fourier Transform-InfraRed spectroscopic measurements of this plasma were in good agreement at $395 \pm 10K$. These results indicate that within a normal glow discharge environment, CO $4^{th}$ Positive LIF is well suited as a temperature diagnostic.
Description
$^{a}$S. DeBenedictis, Chem. Phys., 71, p.247, 1982. $^{b}$G.L. Wolk and J.W. Rich, Chem. Phys. Lett. 87, p. 117, 1982.
Author Institution: Nonequilibrium Thermodynamics Laboratory, Department of Mechanical Engineering, The Ohio satte University; Department of Chemistry, The Ohio satte University
Author Institution: Nonequilibrium Thermodynamics Laboratory, Department of Mechanical Engineering, The Ohio satte University; Department of Chemistry, The Ohio satte University