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Proceedings Paper

Fourier transform spectroscopy of atmospheric gases
Author(s): Michel R. Carleer; Sophie Fally; Reginald Colin; Alain Jenouvrier; Bernard Coquart; Marie-France Merienne; Ann Carine Vandaele; Christian Hermans
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Paper Abstract

NO2 absorption cross-sections have been obtained at 220 K and 294 K at a resolution of 2 cm-2 from a series of spectra recorded with pure NO2 at pressures from 0.007 to 2 torr. The N2O4 absorption cross-section has been obtained at 220 K. The uncertainty in the NO2 cross-sections is estimated to be less than 3 percent for the spectral region below 40000 cm-1 at 294 K, 3 percent below 30000 cm-1 at 220 K. Temperature and pressure effects have been observed. Comparison with literature data show good agreement between 37500 and 20000 cm-1. O2 absorption spectra have been recorded at high and low resolution in the UV. A re-analysis of the three Herzberg band systems has been performed, extending the rotational assignment up to N equals 31 and identifying several new vibrational bands. Determination of the integrated intensities and oscillator strengths of the bands has been performed. These values have been compared with data of the literature. Spectra recorded with increasing pressures of N2 or Ar show that the structure d continuum overlapping the Herzberg bands cannot be explained by O2-O2 absorption, but comes from collision induced absorption. Low resolution spectra have also been recorded in the visible region in order to determine the (O2)2 absorption cross-section.

Paper Details

Date Published: 15 December 1998
PDF: 10 pages
Proc. SPIE 3493, Spectroscopic Atmospheric Environmental Monitoring Techniques, (15 December 1998); doi: 10.1117/12.332640
Show Author Affiliations
Michel R. Carleer, Univ. Libre de Bruxelles (Belgium)
Sophie Fally, Univ. Libre de Bruxelles (Belgium)
Reginald Colin, Univ. Libre de Bruxelles (Belgium)
Alain Jenouvrier, Groupe de Spectroscopie Moleculaire et Atmospherique (France)
Bernard Coquart, Groupe de Spectroscopie Moleculaire et Atmospherique (France)
Marie-France Merienne, Groupe de Spectroscopie Moleculaire et Atmospherique (France)
Ann Carine Vandaele, Belgian Institute for Space Aeronomy (Belgium)
Christian Hermans, Belgian Institute for Space Aeronomy (Belgium)

Published in SPIE Proceedings Vol. 3493:
Spectroscopic Atmospheric Environmental Monitoring Techniques
Klaus Schaefer, Editor(s)

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