15min:

ROBERT R. BOUSQUET, KEI-ICHI C. NAMIKI, TIMOTHY C. STEIMLE, Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287; ANTHONY J. MERER, Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.

The 0₀⁰ and 3₁⁰ band systems of the ²A₁ ²A₁ transition of YC₂ were recorded in high resolution using laser-induced fluorescence on molecules produced in a molecular beam. Asymetry splittings in the ²A₁ state were measured by recording the optical spectrum in the presence of a weak static electric field . Several pure rotational transitions were also recorded in the (0,0,0) ²A₁ vibronic state using pump/probe microwave optical double resonance spectroscopy. The three sets of parameters were combined to produce fine and hyperfine parameters for the and states. Rotational constants and structural parameters were determined for both electronic states by fitting the combined data sets to an effective hamiltonian for a rigid molecule. An interpretation of the fine structure parameters will be given.