15min:

C. LINTON, Physics Department, University of New Brunswick, P.O.Box 4400, Fredericton, NB, Canada E3B 5A3; F. MARTIN, P. CROZET, A. J. ROSS, I. RUSSIER, A. YIANNOPOULOU, Laboratoire de Spectrométrie Ionique et Moléculaire (CNRS UMR5579), and Université Lyon I, Campus la Doua, Bâtiment 205, 69622 Villeurbanne Cedex, France; L. LI, Department of Modern Applied Physics, Tchinghua University, Beijing, China; AND A. M. LYYRA, Department of Physics, Temple University, Philadelphia, PA 19122, USA.

Perturbation Facilitated Optical Optical Double Resonance (PFOODR) has been used to access the v=0,1 and 2 levels of the 2³_g state of ⁷Li₂ via mixed A¹_u⁺ ~ b³_u levels. Fluorescence to the a³_u⁺ state, recorded at high resolution on a Fourier transform spectrometer, gave transitions to the v=0-9 levels of the a³_u⁺ state and allowed us to observe levels very close to the dissociation limit. A Near Dissociation Expansion (NDE) technique was used to determine the dissociation energy. The results of our analysis will be presented and the correlation with recent photoassociation data will be discussed.

In a separate OODR experiment, fluorescence from the 5d¹_g Rydberg state of ⁷Li₂ to the C¹_u and 2¹_u⁺ "Double Minimum" states was examined allowing us to extend the previous analysis of the 2¹_u⁺ state. The spectra also provided new information on the v=0 and 1 levels of the C¹_u state, from which we were able to make a more precise determination of its potential minimum and T_e value.