THE INFRARED ABSORPTION SPECTRA OF MATRIX ISOLATED SYMMETRIC-TOP MOLECULES: METHYL ACETYLENE, METHYL CHLORIDE AND METHYL BROMIDE
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Date
1962
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Ohio State University
Abstract
The infrared spectra of gascous methyl acetylene, chloride and bromide, isolated in dilute argon matrices, (1:1000) have been observed in the region of $3000 cm^{-1}$ at 4 and $20^{\circ} K$ under high dispersion. The $20^{\circ} K$ spectra, for all the molecules consist of three bands which correspond closely to $\nu_{1}$, $\nu_{4}$ and $2\nu_{5}$. At $4^{\circ} K$. the intensity of these bands increase and the perpendicular band $\nu_{4}$ splits into 3 distinct components in the ease of methyl acetylene and bromide, showing only incipient splitting in the chloride. The central component of $\nu_{4}$ is the most intense and the two weaker components are spaced equally on either side of the central component. The strong feature in this triad is assigned to $^{R}Q_{0}$ and the weaker component to $^{P}Q_{1}$ and $^{R}Q_{1}$. The results can be interpreted using the same model as in the ease of the hydrogen halides.
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Author Institution: National Bureau of Standards; Cryogenic Laboratory, Department of Chemistry, The Ohio State University