Laboratory measurements of NO2 line parameters near 1600/cm for the interpretation of stratospheric spectra

Physics

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Balloon-Borne Instruments, Infrared Spectroscopy, Nitrogen Dioxide, Stratosphere, Tunable Lasers, Error Analysis, Pressure Dependence, Spectral Bands, Temperature Dependence, Thermal Emission

Scientific paper

Tunable diode laser laboratory measurements of infrared spectral parameters of selected NO2 lines near 1600/cm have been made to assess the contribution of uncertainties in these parameters to stratospheric measurements of NO2 made using the Balloon-Borne Laser In-Situ Sensor (BLISS) tunable diode laser spectrometer. Relative line intensities are measured to accuracies of better than 2 percent, with a root-sum-squared uncertainty in the absolute linestrengths of 4.5 percent. Air-broadening coefficients have been determined from measurements at total pressures in the range 20-100 Torr, at temperatures of 293 K and 214 K. These results are also discussed in the light of the discrepancies between infrared instruments flown in the 1982 and 1983 Balloon Intercomparison Campaigns.

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