Tunable diode laser measurements of absolute linestrengths in the HNO3 band near 5.8 microns

Computer Science – Sound

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Infrared Spectra, Laser Spectroscopy, Line Spectra, Molecular Spectra, Nitric Acid, Tunable Lasers, Acid Rain, Atmospheric Composition, Balloon Sounding, Laser Spectrometers, Solid State Lasers

Scientific paper

Absolute line strengths of selected lines in the nu 2 band of HNO3 have been measured using a tunable diode laser spectrometer operating in a sweep integration mode. The direct measurement technique has been employed to obtain line intensities at 296 K for 22 isolated lines in the 1720-1725/cm region. The reported line strengths have estimated uncertainties of 4 percent, a significant portion of this uncertainty arising from spectral interference from hot band transitions. From these line-strength measurements, an integrated band intensity of 1375/sq cm per atm at 296 K is inferred.

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