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GLOBAL FIT ANALYSIS INCLUDING THE $\nu_{9}+\nu_{4}-\nu_{4}$ HOT BAND OF ETHANE: EVIDENCE OF INTERACTION WITH THE $\nu_{12}$ FUNDAMENTAL

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/30963

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dc.creator Cooper, J. R. en_US
dc.creator Moazzen-Ahmadi, N. en_US
dc.date.accessioned 2008-01-12T13:14:18Z
dc.date.available 2008-01-12T13:14:18Z
dc.date.issued 2006 en_US
dc.identifier 2006-RC-12 en_US
dc.identifier.uri http://hdl.handle.net/1811/30963
dc.description Author Institution: Department of Physics and Astronomy, 2500 University Drive NW, Calgary,; Alberta T2N 1N4, Canada en_US
dc.description.abstract The $\nu _{9}$ (methyl rock) fundamental band of ethane occurs in the 12 $\mu $m region. It is the strongest band of ethane in a terrestrial window and is commonly used for the identification of ethane in the Jovian planets. The $\nu _{9}+\nu _{4}-\nu _{4}$ band occurs in the same region; neither can be analysed as an isolated band, since both are embedded in the torsional bath of the ground vibrational state. We report here a global fit model including data from the $\nu_{3}$ (C-C stretch) fundamental, the $\nu_{4}$, $2\nu_{4}-\nu_{4}$, and $3\nu_{4}$ torsional transitions, the $\nu_{9}$ fundamental, and its $\nu_{9}+\nu_{4}-\nu_{4}$ hot band. The combined data set of more than 4000 lines has been fitted to within experimental uncertainty using a model Hamiltonian which includes many terms which were important in analyzing the corresponding hot band of CD$_{3}$CD$_{3}$. We have therefore identified Coriolis interactions with the ground vibrational state (gs) for both the $\nu_{9}$ and $\nu_{9}+\nu_{4}-\nu_{4}$ bands, as well as gs/$\nu_{3}$ Fermi coupling, and have determined several barrier-dependence terms which were not previously accessible. More remarkably, we have also identified a new, resonant interaction with the $\nu_{12}$ fundamental which -- unlike terms included in previous models -- is off-diagonal in the torsional quantum number $\sigma$. en_US
dc.language.iso English en_US
dc.title GLOBAL FIT ANALYSIS INCLUDING THE $\nu_{9}+\nu_{4}-\nu_{4}$ HOT BAND OF ETHANE: EVIDENCE OF INTERACTION WITH THE $\nu_{12}$ FUNDAMENTAL en_US
dc.type article en_US