15min:
THE ROTATIONAL SPECTRUM OF H15NO3: ALL STATES BELOW 1000 cm-1.

DOUGLAS T. PETKIE, MARK KIPLING AND ASHELY JONES, Department of Physics, Wright State University, Dayton OH 45435; PAUL HELMINGER, Department of Physics, University of South Alabama, Mobile, AL 36688; IVAN MEDVEDEV AND ATSUKO MAEDA, Department of Physics, The Ohio State University, Columbus, OH 43210; BRIAN J. DROUIN AND CHARLES E. MILLER, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109-8099.

The rotational spectrum of H15NO3 was recorded using isotope enriched samples at Ohio State University with the FASSST spectrometer and at the Jet Propulsion Laboratory with the cascaded frequency multiplication spectrometer. The OSU system used a heated cell over the frequency range of 118-370 GHz while the JPL room temperature measurements included the frequency ranges of 74-109, 400-410, 639-656, and 800-850 GHz. Transitions in the ground and six lowest vibrational states, 61, 71, 81, 91, and the 51/92 dyad, have been assigned and fit using Watson-type Hamiltonians. The 91 and 92 states require torsional parameters to account for the observed torsional splitting of sim2.4 MHz and sim70 MHz, respectively. Fermi and Coriolis interactions were included to accurately describe the strong interactions in the 51/92 dyad and to account for an observed torsional splitting of sim15 MHz induced onto the 51 state. The analysis of each state will be presented along with a discussion of the spectroscopic constants.