			10min:

MEASUREMENT OF NITROGEN HYPERFINE STRUCTURE ON THE 53 CM (562 MHz) BUTYRONITRILE LINE.

CHRISTOPHER T. DEWBERRY, GARRY S. GRUBBS II, ANDREW RAPHELT AND STEPHEN A. COOKE, The Department of Chemistry, University of North Texas, P.O. Box 305070, Denton, TX, 76203-5070.

Recent improvements to our cavity-based Fourier transform radiofrequency spectrometer will be presented. Amongst other improvements use of Miteq amp, model AMF-6F-00100400-10-10P (0.1 GHz to 4 GHz, 65 dB gain minimum, 1 dB noise figure maximum) together with shielding from an improved Faraday cage have significantly helped us in this regard. Electromagnetic fields within our near-spherical cavity have been modeled and results will be presented. We have been able to easily resolve the nitrogen hyperfine structure on the ^aQ_0,-1 transition 1_1,0 leftarrow 1_1,1 located at 562 MHz. This result will be discussed.