Broadening parameters of NO2 lines in the 3.4 μm spectral region.

Statistics – Applications

Scientific paper

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Molecular Spectra: Infrared Spectra, Molecular Spectra: Line Broadening

Scientific paper

Fourier transform spectra have been recorded to measure self-, N2-, and O2-broadening coefficients of NO2 lines in the υ1+υ3 band. For the studied set of transitions, a slight rotational dependence of the broadening coefficients exists versus N″ the rotational quantum number of the lower level of the transition, whereas no significant dependence is observed versus Ka″ An empirical relation, allowing one to calculate approximate values of the air-broadening coefficients γair0, at 296 K, for lines observable in atmospheric spectra recorded from the ground, is proposed. For typical lines used for atmospheric applications, the single value reported in the HITRAN database for all lines of all bands of NO2 can differ by more than 20% from the measured ones.

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