Infrared absorptivity of the 9.6 micron ozone band as a function of spectral resolution and abundance

Physics

Scientific paper

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Absorptance, Air Pollution, Infrared Spectra, Ozonometry, Pollution Monitoring, Abundance, Air Sampling, Spectral Bands, Spectral Resolution

Scientific paper

The infrared absorptivity of the R-branch maximum (9.48 microns) of ozone was determined at 25 C as a function of spectral resolution and absorbance, in an effort to examine the 30% discrepancy between the respective wet chemical calibration procedures for ozone carried out by the California Air Resources Board and the Los Angeles Air Pollution Control District. Ozone samples produced by a high voltage discharge in oxygen were measured spectroscopically in an environmental chamber at paths up to 69.17 m. The IR absorptivity varied about 20% (from 3.9-4.8/cm STP) and was found to be weakly dependent on ozone abundance.

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