Abstract
Fourier transform infrared absorbance measurements of small aliquots of anhydrous nitric acid were used to determine regional, integrated cross sections at 278.2, 298.22 and 323.15 K . Spectra were recorded with pressure broadened samples (1 atmosphere nitrogen), in a 20 cm path length cell at a spectral resolution of 0.112 cm −1 . Spectral regions measured include the vibrational bands: ν 1 (∼3552 cm −1) , ν 2 (∼1710 cm −1) , ν 3, ν 4 (∼1320 cm −1) , and ν 5, 2ν 9 (∼890 cm −1) and regions of weaker absorption between 820 and 5300 cm −1 . We observe expected changes in the distribution of rovibrational intensities with temperature, but to the accuracy of our measurements, cross-sections integrated over entire vibrational bands are independent of temperature.
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