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dc.creatorPine, A. S.en_US
dc.creatorRinsland, C. P.en_US
dc.date.accessioned2006-06-15T19:08:33Z
dc.date.available2006-06-15T19:08:33Z
dc.date.issued1998en_US
dc.identifier1998-TF-17en_US
dc.identifier.urihttp://hdl.handle.net/1811/19067
dc.description$^{a}$ C. Rinsland et al. J. Geophys. Res. 92, 11951 (1987). $^{b}$ A. Pine and W. Lafferty, J. Res. NBS. 87, 237 (1982). $^{c}$ A. Pine and S. Stone, J. Mol. Spectrosc. 175, 21 (1996).en_US
dc.descriptionAuthor Institution: Alpine Technologies, 14401 Poplar Hill Road; Atmospheric Sciences Division, NASA Langley Research Centeren_US
dc.description.abstractThe strong and sharp $^{p}Q_{3}$ subbranch of the $\nu_{7}$ band of ethane near $2976.8 cm^{-1}$ is relatively free of interfering lines of methane, water and ozone and has been utilized as the signature of ethane for atmospheric $monitoring^{a}$. This subbranch is unresolvable at the Doppler limit, even at low T $(119 K)^{b}$. However, the rotational structure and torsional splittings have been obtained by subDoppler molecular-beam $spectroscopy^{c}$, along with the air-broadening coefficients and their temperature dependence, so that the fundamental band can be well characterized, apart from a minor perturbation evident at high J. This still leaves a significant fraction of the observed structure and intensity in this region unassigned. The strong temperature dependence of this extraneous structure enables us to attribute it to torsional hot bands, which improves the quantitative estimates of atmospheric ethane. We also discuss various approximations to the ethane partition function, accounting for the highly anharmonic torsional mode, needed for the accurate scaling of the intensities over the wide range of atmospheric temperatures.en_US
dc.format.extent119173 bytes
dc.format.mimetypeimage/jpeg
dc.language.isoEnglishen_US
dc.publisherOhio State Universityen_US
dc.titleTHE ROLE OF TORSIONAL HOT BANDS IN MODELING ATMOSPHERIC ETHANEen_US
dc.typearticleen_US


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