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MARILYN E. JACOX AND WARREN E. THOMPSON, Optical Technology Division, National Institute of Standards and Technology, Gaithersburg, MD 20899-8441.
Absorptions arising from the A-X transition of normal and isotopically substituted NO3 have been observed between 7500 and 9500 cm-1. Details of the spectra will be discussed and assignments will be proposed. Absorptions arising from the B-X transition of NO3, with band origin near 15 000 cm-1, have also been observed for the normal species and two of its isotopologues which possess D3h symmetry. As in the gas phase, the absorptions are broadened because of predissociation. The observed band structure corresponds closely with that reported for the gas-phase molecule.