INFRARED SPECTRUM OF THE DIFLUOROMETHYL RADICAL IN SOLID ARGON.

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1969

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Ohio State University

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Abstract

When $HCBrF_{2}$ and $DCBrF_{2}$ at high dilution in argon are codeposited with an atomic beam of lithium on a CsI window at $15^{\circ}K$, lithium bromide absorptions appear along with several new absorptions not present when the precursor was deposited without alkali metal. These new absorptions are assigned to the antisymmetric hydrogen bending and carbon-fluorine stretching modes and the symmetric C-F vibration of the $HCF_{2}$ and $DCF_{2}$ radicals. The antisymmetric vibrational assignments are supported by product rule and normal coordinate calculations which give the potential constants $F_{55} = 5.27 \pm 0.1 mdyn/\AA$, $F_{56} = 0.44 \pm 0.02 mdyn/rad$ and $F_{66} = 0.64 \pm 0.05 mdyn{\AA}/rad^{2}$. An approximate force constant $F_{22} = 7.19 \pm 0.5 mdyn/\AA$ is calculated from the symmetric C-F vibration. The carbon-fluorine valence force constant for $HCF_{2}$ is in the range of those for typical fluorocarbons.

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Present address of T. Granvile Carver: UNIROYAL, Inc., Research Center, Wayne, N.J., 07470.
Author Institution: Uniroyal, Inc., Research Center; Department of Chemistry, University of Virginia

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