Improved spectral parameters for the three most abundant isotopomers of the oxygen molecule.

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Molecular Oxygen: Molecular Data, Molecular Oxygen: Laboratory Spectra

Scientific paper

Line positions, intensities, transition-moment squared, and lower state energies are calculated for the three most abundant isotopomers of the oxygen molecule in the terrestrial atmosphere, 16O2, 18O16O and 17O16O. All lines passing a wavenumber dependent cutoff procedure (3.7×10-30 cm-1/(molecule cm-2) at 2000 cm-1) are retained for the 1996 HITRAN database. Halfwidths as a function of the transition quantum numbers are determined from the available experimental measurements. Explicit expressions are obtained relating line intensities to the transition-moment squared, the vibrational band intensity, and the electronic-vibrational Einstein-A coefficient. The statistical degeneracy factors are presented and misuse of these factors in previous works is explained. Finally, band-by-band comparisons between the new calculations and the data from the previous HITRAN database are made.

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