INFRARED BANDS OF ACETYLENE.
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Date
1965
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Ohio State University
Abstract
The absorption spectra of acetylene at 3 and $13.7 \mu$ have been reexamined under high resolution, and a number of new features have been observed. The complex rotational structure at $13.7 \mu$ has been $analyzed^{1}$ and assigned to five bands of $^{12}C_{2}H_{2}$ and one of $^{12}C^{13}CH_{2}$. Rotational and vibrational constants have been evaluated and a value of $g_{45} = 9.75 cm^{-1}$ obtained from the transitions $(\nu_{4}+\nu_{5})^{0}-\nu^{1}_{4}$ and $(\nu_{4}+\nu_{5})^{2}-\nu_{4}^{1}$ of $^{12}C_{2}H_{2}$. An earlier $assignment^{2}$ of $2\nu_{5}^{2}-\nu_{5}^{1}$ has been revised. Analysis of the rotational structure at $3 \mu$ has revealed the presence of three II-II bands not previously identified. Among the results to be presented are the assignments of these II-II bands and the evaluation of rotational and vibrational constants pertaining to the energy levels involved.
Description
Supported, in part, by the Air Force Cambridge Research Laboratories, Office of Aerospace Research through a contract with The Ohio State University Research Foundation. $^{1}$ J.F. Scott and K. Narahari Rao, J. Mol. Spectroscopy (in press). $^{2}$ See E. K. Plyler, E. D. Tidwell and T. A. Wiggins, J. Opt. Sec. Am 53, 589 (1963).
Author Institution: Laboratory of Molecular Spectroscopy and Infrared Studies, Department of Physics The Ohio State University
Author Institution: Laboratory of Molecular Spectroscopy and Infrared Studies, Department of Physics The Ohio State University