10min:

V. I. PEREVALOV, S. A. TASHKUN, Institute of Atmospheric Optics, Russian Academy of Sciences, Siberian Branch, 1 Akademicheskii Avenue, 634055 Tomsk, Russia; C. CLAVEAU, J--L. TEFFO, Laboratoire de Physique Moléculaire pour l'Atmosphère et l'Astrophysique, CNRS UMR 7092, case 76, Université Pierre et Marie Curie, 4 Place Jussieu, F-75252 Paris Cedex 05, France; J. VANDER AUWERA, Service de Chimie Quantique et Photophysique C.P. 160/09, Université Libre de Bruxelles, 50 Avenue F. D. Roosevelt, B--1050 Brussels, Belgium.

This work deals with the modeling of line intensities of cold and hot bands of ¹³C¹⁶O₂ corresponding to P=5 transitions (P = 2V₁ + V₂ + 3V₃), using the effective operators approach. In Brussels, 5 unapodized absorption spectra of ¹³C¹⁶O₂ (98% purity, P × \ell = 7.43-538~mbar×m, room temperature) were recorded at a resolution of 0.0035 cm^-1 (MOPD~= 257.1~cm) using a Bruker IFS120HR. 382 absolute line intensities were measured in 9 bands observed between 3090 and 3920 cm^-1. In Paris, 2 apodized absorption spectra of an ¹⁸O--enriched CO₂ sample (297.0~K, \ell = 8.07(2) and 36.07(4)~m, P~=~1.685(8)~torr) containing 0.5% of ¹³C¹⁶O₂ were recorded at a resolution of 0.0043 cm^-1 using a home--made FTS. 90 absolute line intensities were measured for 5 bands observed from 3400 to 3700 cm^-1. A least squares fit of 479 observed line intensities, including those measured in this work and published for the 21102-00001 band, allowed determination of 12 effective dipole moment parameters corresponding to the P = 5 series of transitions (weighted standard deviation = 0.855, RMS deviation = 4.69%). The new set of effective dipole moment parameters will soon be used to update the Carbon Dioxide Spectroscopic Databank (CDSD--1000). Results will be presented and discussed.