HIGH-RESOLUTION FTIR MEASUREMENT AND ANALYSIS OF THE NU-8-BAND OF DEUTERATED NITRIC-ACID (DNO3)

The infrared spectrum of the ν8 band of deuterated nitric acid (DNO3) has been measured with a resolution of 0.002 cm-1 in the frequency range of 730 to 794 cm-1. A total of 1888 assigned transitions have been analyzed to provide rovibrational constants for the upper state with a standard deviation of 0.00022 cm-1. In the course of the analysis, the constants for the ground state were improved. Because of the absence of perturbations, the constants can be used to accurately calculate the infrared line positions for the band. The band is C-type with a band center at 762.8738 ± 0.0001 cm-1. As was found for ν8 of HNO3, the P branch is much weaker than the R branch. Effective Herman-Wallis correction factors are given for the band. © 1991.