NEW MEASUREMENTS ON $\nu_{3}$ OF $CO_{2}^{*}$*
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Date
1961
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Ohio State University
Abstract
The fundamental mode, $\nu_{3}$, of $CO_{2}$ at 4.3 $\mu$ has been re-examined under high dispersion in a vacuum grating spectrometer equipped with a Reeder thermocouple and a 7500 lines-per-inch Bausch and Lomb grating. The spectrometer tank was pumped down to a pressure of about 40 $\mu$ and $CO_{2}$ was admitted to a pressure of 1 mm. The total optical path in the spectrometer is about 8.5 meters. At this pressure and path length the $C^{12} O_{2}$ lines absorb about 40\% at the peak. Silt openings represent about $0.1 cm^{-1}$. Lines of $C^{12}O^{16}_{2}, C^{13}O^{16}_{2}$, and $C^{12}O^{16}O^{18}$ are easily seen and their frequencies are being determined in a vacuum by means of a comparison spectrum of neon lines from a hollow cathode discharge in higher orders of the grating. The molecular constants obtainable from his band will be redetermined.
Description
$^{*}$Supported by the Air Force Cambridge Research Center.
Author Institution: Department of Physics, University of Tennessee
Author Institution: Department of Physics, University of Tennessee