Fourier transform infrared absorbance measurements of small aliquots of anhydrous nitric acid were used to determine regional, integrated cross-sections at 278.2K, 298.22K and 323.15K. 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 included the vibrational bands: v1 (~3575 cm-1), v2 (~1710 cm-1), v3, v4 (~1335 cm-1), and v5, 2v9 (~890 cm-1) and regions of weaker absorption between 820 cm-1 and 5300 cm-1. We observed 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.
Revised: March 2, 2004 |
Published: September 4, 2003
Citation
Chackerian C., S.W. Sharpe, and T.A. Blake. 2003.Anhydrous Nitric Acid Integrated Absorption Cross Sections: 820 - 5300 cm-1.Journal of Quantitative Spectroscopy and Radiative Transfer 82, no. 1-4:p. 429-441.PNNL-SA-37875.