Hyperfine spectroscopy of titanium monochloride and cobalt monofluoride

This thesis presents the spectroscopic study of two transition metal containing diatomic molecules, titanium monochloride (TiCl) and cobalt mono-fluoride (CoF). Their spectra were recorded with the use of a (laser ablation/molecular beam) laser-induced fluorescence spectrometer at sub-Doppler resolution. Data from the experiments were analyzed using a non-linear least-squares fitting FORTRAN program. Molecular constants were well determined for different energy levels of these two transition metal halides.;The 4Γ-X4Φ system of the TiCl radical was fully analyzed. Five subbands of this transition were recorded both at low resolution and at high resolution. Rotational and fine structure constants were determined with satisfying rms errors; the values of r e″ = 2.26473Å, ΔG″(1/2) = 404.338cm−1 and re′ = 2.26310Å, ΔG′(1/2) = 431.103cm−1 were calculated for the ground state (X4Φ) and the upper state (4Γ) respectively. Possible electronic configurations for both states are discussed.;Four bands of CoF were recorded at 503, 511, 484 and 469nm at high resolution and were assigned to (1-0) [19.2]3Φ4-X 3Φ4,(1-0) [18.9]3Φ4-X 3Φ4, (0-0) [20.6]3Γ5-X 3Φ4 and (1-0) [20.6]3Γ5-X 3Φ4 transitions respectively. The hyperfine structure due to the nuclear spin of Co was dominant in all these bands. Hyperfine splitting due to the nuclear spin of fluorine can only be found in the latter two bands, partly because the electronic configurations of the 3Γ upper states are quite different from those of the former two bands. The recorded data were fit band by band, yielding accurate effective rotational constants and hyperfine interaction parameters. Possible electronic configurations for the states involved in the transitions are given and discussed with respect to those of CoH and also the measured hyperfine parameters.