THE HYPERFINE-STRUCTURE OF THE C-1-PI-X(1)SIGMA(+) TRANSITION OF CUF

The hyperfine structure of the (CUF)-C-63 (CII)-I-1-X(1) Sigma(+) tran sition has been studied by laser-induced fluorescence in the sub-Doppl er regime. Splittings of the ro-vibronic lines due to interactions wit h the copper (I = 3/2) and fluorine (I = 1/2) nuclei are observed in t he P, Q, and R branches. The various contributions arising from magnet ic dipole and from electric quadrupole interaction are specified. Pari ty dependent and independent terms are required to explain the dissimi lar splitting patterns in the Q and the P/R branches. Hyperfine parame ters for the C state of copper monofluoride are reported for the first time.