WE10		15min4:14

THOMAS A. BLAKE, STEVEN W. SHARPE, Battelle/Pacific Northwest National Laboratory, P. O. Box 999, MS K3- 58, Richland, WA 99352; STEVEN C. STONE, LAURA A. PHILIPS, Department of Chemistry, Cornell University, Ithaca, NY 14853-1301.

The ₅ and ₇ fundamental bands of hexafluoroethane were observed using two molecular beam techniques: pulsed slit-jet, diode laser spectroscopy, and continuous slit-jet, Fourier transform spectroscopy. The estimated rotational temperature of both beams is on the order of 10 K. Preliminary analysis of the ₅ parallel band shows a regular progression of strong K = 0 transitions in the P, Q, and R-branches; other sub-bands are heavily perturbed. The band origin is at 1117.1098(5) cm^-1, B'' = 0.06140(9) cm^-1, and B' = 0.061641 cm^-1 for the prolate symmetric top molecule. The ₇ perpendicular band is centered at 1253 cm^ -1 and shows a congested series of ^RQ and ^PQ sub-branches. Spectra from both spectrometers and a detailed ro-vibrational analysis will be presented for both bands.