The Knowledge Bank is scheduled for regular maintenance on Thursday, August 13th, 5:00 pm to 8:00 pm EDT. During this time, the Knowledge Bank will not be available and users will not be able to register, login, or submit content.

Show simple item record

dc.creatorBunker, P. R.en_US
dc.creatorLauro, C. Dien_US
dc.creatorJohns, J. W. C.en_US
dc.creatorMcKellar, A. R. W.en_US
dc.descriptionAuthor Institution: Herzberg Institute of Astrophysics, National Research Council of Canadaen_US
dc.description.abstractWe 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.extent117958 bytes
dc.publisherOhio State Universityen_US

Files in this item


Items in Knowledge Bank are protected by copyright, with all rights reserved, unless otherwise indicated.

This item appears in the following Collection(s)

Show simple item record