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Argon broadening of the CO R(0) and R(7) transitions in the fundamental band at temperatures between 80 and 297 K: comparison between experiment and theory |
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| Authors: | AW Mantz F Thibault B Fernandez H Koch C Claveau D Hurtmans |
| Institution: | a Laboratoire de Physique Moléculaire et Applications (C.N.R.S.), Université Pierre et Marie Curie, 4 Place Jussieu, Tour 13, Case 76, F-75252 Paris Cedex 05, France b Department of Physics Astronomy and Geophysics, Connecticut College, 270 Mohegan Avenue, New London, CT 06320, USA c Laboratoire P.A.L.M.S., Université de Rennes I, Campus de Beaulieu Bât. 11B, Avenue du Général Leclerc, F-35042 Rennes Cedex, France d Department of Physical Chemistry, University of Santiago de Compostela, E-15706, Santiago de Compostela, Spain e Institute of Molecular Science, University of Valencia, E-46100 Burjassot, Valencia, Spain f Service de Chimie Quantique et de Photophysique (Atomes, Molécules et Atmosphères), formerly Laboratoire de Chimie Physique Moléculaire, CP160/09, Université Libre de Bruxelles, Av. F. D. Roosevelt, 50, B-1050 Brussels, Belgium |
| Abstract: | We present measurements of Ar-broadening parameters for the R(0) and R(7) lines in the fundamental band of 13CO at eight temperatures from 80 to 297 K. The broadening parameters are determined by simultaneous least-squares fitting of spectra recorded using a frequency stabilized diode laser spectrometer. The comparison of the broadening parameter values for R(7) derived at room temperature and different pressures from different line profiles shows that an empirical line profile, which takes into account narrowing effects (Dicke narrowing and absorber speed dependence) but neglects any correlation between collisions, is able to describe the observed lines with constant values of the narrowing and broadening parameters over a 10-500 Torr pressure range. Starting from a recent ab initio potential energy surface, theoretical thermally averaged close coupling values of the Ar broadening parameter are calculated for the same temperatures. The comparison between experimental and calculated values shows an overall agreement of 1.5%. |
| Keywords: | Tunable diode laser Line broadening Carbon monoxide Low temperature |
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