MEASUREMENT OF HYDROGEN-BROADENED LINE WIDTHS OF CO AT LOW TEMPERATURES

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1986

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Ohio State University

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Prompted by the need expressed by astronomers observing the $5 \mu$m spectra of Jupiter and Saturn, we have measured hydrogen-broadened half-widths of several lines in the P- Branch of the fundamental band of $^{12}CO$ at 100, 150, 250, and 29B K in our laboratory. We have employed a tunable diode laser spectrometer and the sweep-integration technique. The variation of the line widths with temperature may be described according to the empirical power law: $\gamma^{o}_{j}\sim \tau^{-n}$ with $n = 0.678 + 0.005$.

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Supported by the Planetary Atmospheres Branch of the Solar System Exploration Division of NASA under Grand-in-Aid No. 33-015-139. Address of the authors: Laboratory for Planetary Atmospheres Research, State University of New York, Stony Brook, NY 11794-2300
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