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 dc.creator Bunker, P. R. en_US dc.creator Lauro, C. Di en_US dc.creator Johns, J. W. C. en_US dc.creator McKellar, A. R. W. en_US dc.date.accessioned 2006-06-15T15:17:05Z dc.date.available 2006-06-15T15:17:05Z dc.date.issued 1992 en_US dc.identifier 1992-WE-16 en_US dc.identifier.uri http://hdl.handle.net/1811/12935 dc.description Author Institution: Herzberg Institute of Astrophysics, National Research Council of Canada en_US dc.description.abstract We are studying dimethylacetylene (2-butyne) in the $1000-1100 cm^{-1}$ region the $\nu_{11}$ and $\nu_{11}$ and $\nu_{15}$ (methyl rocking) fundamental bands. The spectrum was recorded at a temperature of -60 C with a pressure of 1.4 Torr, an absorption path of 8 m, and a resolution of $0 0.0014 cm-^{1}$, using our modified double-pass Bomem FT spectrometer and cooled multiple-traversal cell. The spectrum is congested, with thousands of resolved and partly-resolved lines as well as many regions where the rotational structure is unresolved. In spite of this complexity, we have been able to make significant progress in the analysis of the bands. More than 200 p, Q, and R-branch transitions in $K_{i} = 0$ (with $K^{\prime\prime} =0$ and 6) and $K_{i} = 3$ (with $K = 3$) subbands have been assigned, where $K_{i}$ is the torsional quantum number. Analysis of these lines gives a value of $B = 0.11190 cm^{-1}$ for the rotational constant of the molecule in its ground state, Q-branches of numerous subbands with other values of $K_{i}$ can also be recognized in the spectrum, and their analysis will be discussed. Dimethylacetylene has long been of theoretical interest as one of the simplest examples of a molecule with a near-zero barrier to internal rotation. However, as far as we know the present study constitutes the first rotationally analyzed spectrum of this fundamental species. en_US dc.format.extent 117958 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title THE FIRST ROTATIONAL ANALYSIS OF THE INFRARED SPECTRUM OF DIMETHYLAETYLENE en_US dc.type article en_US
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