10min:

L. DAUMONT, J-L. TEFFO, Laboratoire de Physique Moléculaire et Applications, CNRS, Boîte 76, Université Pierre et Marie Curie, 4 Place Jussieu, F-75252 Paris-Cedex 05, France; J. VANDER AUWERA, Laboratoire de Chimie Physique Moléculaire C. P. 160/09, Université Libre de Bruxelles, 50 avenue F. D. Roosevelt, B-1050 Brussels, Belgium; V. I. PEREVALOV AND S. A. TASHKUN, Institute of Atmospheric Optics, Russian Academy of Sciences, Siberian Branch, 1 Akademicheskii avenue, 634055 Tomsk, Russia.

This work continues a series of publications devoted to the application of the effective operators approach to the vibrational-rotational treatment of linear triatomic molecules, aiming at the analysis and prediction of infrared spectra of such molecules. In that frame, the present work aims at describing line intensities of cold and hot bands of ¹⁴N₂¹⁶O in its ground electronic state in the spectral range above 3600 cm^-1. Because of the very large spectral range and number of data, the treatment is first done on a polyad-by-polyad basis.

The absorption spectra of N₂O, at room temperature, have been recorded at a resolution of 0.007 cm^-1 in the range from 4300 to 5200 cm^-1 using a Bruker IFS120HR Fourier transform spectrometer. Sample pressure / absorption path length products ranging from 7 to 540 mbar have been used. More than 1000 absolute line intensities have been measured in 21 bands belonging to the P = 2 v₁ + v₂ + 4 v₃ = 8 series. Using wavefunctions previously determined from a global fit of an effective hamiltonian to about 18000 line positions, parameters of a corresponding effective dipole moment have been fitted to the experimental intensities of cold and hot bands. Results will be presented and discussed.