Study of molecular line parameters down to very low temperature |
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| Authors: | D Mondelain C Camy-Peyret W Deng S Payan AW Mantz |
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| Institution: | (1) Laboratoire de Physique Moléculaire pour l’Atmosphère et l’Astrophysique, UMR 7092, CNRS – Université Pierre et Marie Curie, Case 76, 4 place Jussieu, 75252 Paris Cedex 05, France;(2) Laboratory of Bond Selective Chemistry, Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026, China;(3) Department of Physics, Astronomy and Geophysics, Connecticut College, 270 Mohegan Avenue, New London, CT 06320, USA |
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| Abstract: | The impact of precise spectroscopic measurements on the P(9) multiplet in the ν3 band of 12CH4, obtained using a newly developed cold Herriott cell coupled with a tunable diode laser spectrometer, is examined in the
context of remote sensing of methane in the atmosphere. More specifically, the influence of the air-broadening temperature
dependence, of line narrowing and of line-mixing effects is assessed when fitting high resolution atmospheric spectra recorded
from a balloon in the solar occultation mode. This is achieved by considering residuals and retrieved methane volume mixing
ratio profiles. By combining data from previous studies together with new measurements, the expression for the temperature
dependence of the broadening coefficient has been revisited. It is shown that a correcting factor applied to the usual law
gives better results, when considering all the available measurements from room temperature down to about 10–20 K, as compared
to the usual expression of the width versus temperature. These results clearly demonstrate that collision broadening is more
sensitive to long-range attractive forces when the temperature is decreased.
PACS 33.70.Jg; 34.20.-b |
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