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N$_2$ COLLISIONAL BROADENING OF METHANE IN THE THZ REGION MEASURED AT THE SOLEIL SYNCHROTRON

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/45989

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Title: N$_2$ COLLISIONAL BROADENING OF METHANE IN THE THZ REGION MEASURED AT THE SOLEIL SYNCHROTRON
Creators: Boudon, V.; Gabard, T.; Pirali, O.; Roy, P.; Brubach, J. B.; Manceron, L.; Vander Auwera, J.
Issue Date: 2010
Publisher: Ohio State University
Abstract: Recently, we recorded the THz centrifugal distortion-induced spectrum of methane using synchrotron radiation at the SOLEIL facility. Intensities of pure rotation lines of CH$_4$ were precisely measured, from which the induced dipole moment of this weak spectrum, of great interest for planetology, was accurately inferred., in press (2010)} This study should in particular help to measure methane concentrations in Titan's atmosphere., {\em Icarus\/} {\bf 189}, 35--62 (2007).} Here, we continue the work by presenting spectra of CH$_4$/N$_2$ mixtures, again recorded with a 150 m optical path in a White cell and a Bruker IFS 125 HR FTIR spectrometer at the AILES beamline of SOLEIL. More precisely, the spectra were recorded with 5 \% of CH$_4$ in N$_2$ at various total pressures ({\it ca.\/} 100, 200, 400, 600 and 800 mbar). These spectra will allow to measure collisional broadening and shift coefficients, as well as line-mixing parameters, with N$_2$ as a perturber (like in Titan's atmosphere).
URI: http://hdl.handle.net/1811/45989
Other Identifiers: 2010-FC-07
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