MOLECULAR LINE STRENGTH MEASUREMENTS VIA LASER ABSORPTION: THE $v'' = 4,\cdots$, 11 $\Delta v=1$ TRANSITIONS OF SHOCK HEATED CARBON MONOXIDE
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Date
1973
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Ohio State University
Abstract
We have measured the line strengths of a number of individual vibration-rotation lines in the $\Delta v = 1, v^{\prime\prime} = 4,\cdots, 11, \Sigma^{+}_{g}$ vibrational bands of carbon monoxide. The experimental technique consisted of measuring the absorption (behind an incident shock wave) of radiation from a single frequency carbon monoxide gas laser; the equilibrium gas temperatures of the plasma ranged from $3000 - 5000^{\circ} K$ . It was found for the temperature range involved that $\sigma = 3.79 \AA$ (independent of rotational quantum number) is a good representation for the optical collision diameter. Experimental determinations of the transition moment (debye) are compared to numerical calculations of the same quantity; the numerical calculations were based on the accurate vibrational potential function reported by A. W. Mantz et $al.^{1}$ and the dipole moment function for carbon monoxide reported by R. A. Toth, et $al.^{2}$ With the exception of a small systematic difference $(\sim 2\%)$ there is excellent agreement between the measured and calculated line strengths.
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M. F. Weisbach has been a National Research Council Postdoctoral Fellow. $^{1}$ A.W. Mantz, J.K.G. Watson, K. Narahari Rao, D.L. Albritton, A.L. Schmeltekopf and R. N. Zare, J. Mol. Spectrosc. 39, 180 (1971). $^{2}$ Robert A. Toth, Robert H. Hunt and Earl K. Plyler, J. Mol. Spectrosc. 32, 85 (1969).
Author Institution: NASA, Ames Research Center
Author Institution: NASA, Ames Research Center