ABSOLUTE LINE WAVENUMBERS IN THE NEAR INFRARED:$^{12}C_{2}H_{2}$ and $^{12}C^{16}O_{2}^{a}$
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Date
2002
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Ohio State University
Abstract
We obtained 40 absolute line wavenumbers in the $3\nu_{3}$ band of $^{12}C^{16}O_{2}$ between 6927 and $6989 cm^{-1}$ and more than 600 absolute line wavenumbers in the near infrared absorption spectrum of $^{12}C_{2}H_{2}$ between 7060 and $9900 cm^{-1}$ using high-resolution Fourier transform spectroscopy. The calibration of the $CO_{2}$ line wavenumbers relied on heterodyne frequencies available in the $\nu_{1} + \nu_{3}$ band of $^{12}C_{2}H_{2}$ near $6556 cm^{-1}$. We have calibrated the acetylene spectra using heterodyne frequencies available in the 2 - 0 band of $^{12}C^{16}O$ and the line wavenumbers obtained in the $ev_{3}$ band of $^{12}C^{16}O_{2}$. Comparison with absolute line wavenumbers obtained independently at JPL in the $3\nu_{3}$ band of $^{12}C_{2}H_{2}$ near $9649 cm^{-1}$, calibrated using absolute wavenumbers available in the 2 - 0 and 3 - 0 (near $6350 cm^{-1}$) bands of $^{12}C^{16}O$, shows good agreement. Finally, we have also determined vibration-rotation constants for the observed upper vibrational states of $^{12}C_{2}H_{2}$, without accounting for the perturbations affecting these states however.
Description
$^{a}$Part of the research described in this paper was carried out by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.
Author Institution: Laboratoire de Chimie Physique Mol\'{e}culaire C. P. 160/09, Universit\'{e} Libre de Bruxelles; Jet Propulsion Laboratory, California Institute of Technology
Author Institution: Laboratoire de Chimie Physique Mol\'{e}culaire C. P. 160/09, Universit\'{e} Libre de Bruxelles; Jet Propulsion Laboratory, California Institute of Technology