N_2 Collisional Broadening of Methane in the Thz Region Measured at the Soleil Synchrotron

Details N_2 Collisional Broadening of Methane in the Thz Region Measured at the Soleil Synchrotron N_2 Collisional Broadening of Methane in the Thz Region Measured at the Soleil Synchrotron

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..confefc07b&link_type=abstract

"International Symposium On Molecular Spectroscopy, 65th Meeting, Held 21-25 June, 2010 at Ohio State University. http://molspec

Astronomy and Astrophysics

Astronomy

Astronomical Species And Processes

Scientific paper

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. This study should in particular help to measure methane concentrations in Titan's atmosphere. 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 (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).
V. Boudon, O. Pirali, P. Roy, J.-B. Brubach, L. Manceron and J. Vander Auwera, J. Quant. Spectrosc. Radiat. Transfer, in press (2010)
A. Coustenis, R. K. Achterberg, B. J. Conrath et al., Icarus 189, 35--62 (2007).

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