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Broadening of the R(0) and P(2) lines in the CO fundamental by helium atoms from 300 K down to 12 K: Measurements and comparison with close-coupling calculations |
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| Authors: | F. Thibault C. Claveau A. Valentin |
| Affiliation: | a UMR 6627 du CNRS, Physique des Atomes, Lasers, Molécules et Surfaces, Université de Rennes I, Campus de Beaulieu, 35042 Rennes Cedex, France b Connecticut College, Department of Physics, Astronomy and Geophysics, 270 Mohegan Avenue, New London, CT 06320, USA c Laboratoire de Physique Moléculaire pour l’Atmosphère et l’Astrophysique (LPMAA), UMR 7092 (C.N.R.S.), Université Pierre et Marie Curie, 4 Place Jussieu, Case 76, F-75252 Paris Cedex 05, France d Université Libre de Bruxelles, Service de Chimie Quantique et Photophysique, CP 160/09 50 av. F. D. Roosevelt, B-1050 Bruxelles, Belgium |
| Abstract: | We present measurements of He-broadening parameters for the R(0) and P(2) lines in the fundamental band of 13CO at different temperatures between 12 K and room temperature. The broadening parameters are determined, taking into account confinement narrowing, by simultaneous least-squares fitting of spectra recorded using a frequency stabilized diode laser spectrometer. The pressure broadening cross sections are deduced and compared to close-coupling calculations and earlier results obtained for rotational transitions of 12CO. |
| Keywords: | Pressure broadening Potential energy surfaces Close coupling Tunable diode lasers |
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