HIGH RESOLUTION INFRARED SPECTRUM OF $\nu_{1}$ OF METHYL DIACETYLENE
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Date
1976
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Journal ISSN
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Publisher
Ohio State University
Abstract
As part of a larger study on the feasibility of high resolution IR and Raman analyses of heavier molecules of chemical interest we have chosen first to Look at methyl diacetylene (MDA) which has $C_{3v}$ symmetry. By comparing our results with previous values of $B_{0}$ obtained from microwave $studies^{1}$ hope to check the validity of our analyses. ""Hot"" bands originating from various quanta of $\nu _{13}$ ($320 cm^{-1})$ and $\nu _{14}$ ($140 cm^{-1})$ are expected to cause problems. The parameters for $\nu_{13}$ and $\nu_{14}$ are available (v = 1) from Kroto and Maier’s MW $work.^{2}$ Thus if the ""hot"" band structure can be resolved out from the fundamental structure, all bands are in principle analyzable. We have recorded $\nu_{1}$ of MDA at spectral slits of $0.014 cm^{-1}$ and $0.030 cm^{-1}$ and analysed the ‘effective’ J structure of this band. Our results yield a $B_{0}$ within $0.0001 cm^{-1}$ of the MW value. The $0,030 cm^{-1}$ spectrum has been deconvoled using techniques discussed last $year^{3}$ to a resolution of $0.007 cm^{-1}$ and the individual components of the ‘effective’ J structure resolved. Analysis is under way.
Description
$^{1}$ R. N. Jones and T. Bach, N. R. C Bulletin No. 11. This research was supported by NASA Research Grant NGL 43-001-006.
Author Institution: Department of Physics and Astronomy, University of Tennessee Knoxville; Department of Chemistry, Queen's University
Author Institution: Department of Physics and Astronomy, University of Tennessee Knoxville; Department of Chemistry, Queen's University