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dc.creatorBoudon, V.en_US
dc.creatorPirali, O.en_US
dc.creatorRoy, P.en_US
dc.creatorManceron, L.en_US
dc.creatorVander Auwera, J.en_US
dc.date.accessioned2009-07-29T12:58:41Z
dc.date.available2009-07-29T12:58:41Z
dc.date.issued2009en_US
dc.identifier2009-TC-02en_US
dc.identifier.urihttp://hdl.handle.net/1811/38289
dc.descriptionA. Coustenis, R. K. Achterberg, B. J. Conrath {\em et al.\/M. Oldani, M. Andrist, A. Bauder and A. G. Robiette, {\em J. Mol. Spectrosc.\/E. H. Wishnow, G. S. Orton, I. Ozier and H. P. Gush, {\em J. Quant. Spectrosc. Radiat. Transfer\/en_US
dc.descriptionAuthor Institution: Institut Carnot de Bourgogne, UMR 5209 CNRS-Universite de Bourgogne, 9. Av. A. Savary, BP 47870, F-21078 Dijon Cedex, France; Ligne AILES -- Synchrotron SOLEIL, L'Orme des Merisiers, F-91192 Gif-sur-Yvette, France; Laboratoire de Dynamique, Interactions et Reactivite, UMR 7075 - Universit Pierre et Marie Curie - CNRS, Case 49, 4 Place Jussieu, F-75252, Paris Cedex, France; Service de Chimie Quantique et Photophysique, Universite Libre de Bruxelles, CP 160/09, 50 avenue F.D. Roosevelt - B-1050 Brussels, Belgiumen_US
dc.description.abstractAs a tetrahedral molecule, methane has no permanent dipole moment. The spectrum of this molecule, however, displays faint absorption lines in the THz region, due to centrifugal distorsion effects. This is important for planetary applications since this region is used to measure methane concentration in some planetary atmospheres, in particular in the case of Titan, {\em Icarus\/} {\bf 189}, 35--62 (2007).}. Up to now, all measurements were relying on some old low resolution spectra, {\bf 110}, 95--105 (1985).}. Even if these results have been reexamined recently {\bf 103}, 102--117 (2007).}, it seemed highly desirable to obtain much more precise laboratory data. The high-intensity synchrotron radiation, combined with a 150 m optical path in a White cell and a Bruker IFS 125 HR FTIR spectrometer at the AILES beamline of SOLEIL, enabled us to record this very weak spectrum at high resolution for the first time. Spectra were recorded at 9.91, 20, 50 and 100 mbar pressure with a resolution of 0.0011, 0.002, 0.005 and 0.01 cm$^{-1}$, respectively. The rotational clusters are fully resolved and the good signal-to-noise ratio should enable precise measurement of transition intensities, yielding an accurate determination of the dipole moment derivative. Such results should allow a better determination of CH$_4$ concentration in planetary objects.en_US
dc.language.isoEnglishen_US
dc.publisherOhio State Universityen_US
dc.titleTHE HIGH RESOLUTION FAR-INFRARED SPECTRUM OF METHANE AT THE SOLEIL SYNCHROTRONen_US
dc.typeArticleen_US


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