HIGH-RESOLUTION ANALYSIS OF THE NU(6), NU(7), NU(8), AND NU(9) BANDS OF (HNO3)-N-15-O-16 MEASURED BY FOURIER-TRANSFORM SPECTROSCOPY

The analysis of the nu(6), nu(7), nu(8), and nu(9) bands of (HNO3)-N-1 5-O-16 located at 646.9641, 578.4719, 743.6166, and 458.2917 cm(-1), r espectively, has been carried out in the 400-800 cm(-1) region using h igh-resolution Fourier transform spectra recorded at Ottawa. Using the ground state energy levels calculated from the upsilon = 0 rotational constants of (HNO)-N-15-O-16, [A. P. Cox, M. C. Ellis, C. J. Attfield , and A. C. Ferris, J. Mol. Struct. 320, 91-106 (1994)], it was possib le to assign the A-type nu(6) and nu(7) bands and the C-type nu(8) and nu(9) bands of (HNO3)-N-15-O-16 up to high J and K-a rotational quant um numbers. The upsilon(6) = 1, upsilon(7) = 1, nu(8) = 1, and upsilon (9) = 1 experimental energy levels were then introduced in a least-squ ares fit calculation and precise upper state Hamiltonian constants (ba nd centers and rotational constants) were determined allowing one to r eproduce the infrared data to within the experimental uncertainty. (C) 1998 Academic Press.