Abstract
We present a high-resolution spectroscopic study of the A~1B2-X~1A1 transition of SiC2 by laser-induced fluorescence. The gas-phase SiC2 molecules are produced in a discharge plasma and cooled in a supersonic jet expansion. By employing a home-made single longitudinal mode optical parametric oscillator as the narrow bandwidth laser source, laser excitation spectra have been recorded with a transition frequency accuracy of ~0.004 cm-1 for the 000,201,301 and 311 bands. Rotational analyses of the high-resolution data have yielded accurate spectroscopic constants, including the centrifugal distortion constants, for the upper vibronic states studied here.
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