LASER VELOCITY MODULATION SPECTROSCOPY OF THE (3)DELTA(3D4S)-X-3-PHI(3D(2)) VISIBLE SYSTEM OF TICL-ORBIT STRUCTURE( AND CHARACTERIZATION OFTHE SPIN)

A single mode cw dye laser excitation along with velocity modulation d etection was used to record between 17 100 and 18 600 cm(-1) the absor ption spectrum of the (3) Delta(3d4s)-X-3 Phi(3d(2)) visible system of TiCl+ produced in an ac glow discharge with a gas mixture of He/TiCl4 . The rotational structure of the (0,0) and (1,0) vibrational bands ha s been observed and fully analyzed for the main isotopomer (TiCl+)-Cl- 35 as well as for (TiCl+)-Cl-37. Beside the confirmation of the nature of the two electronic states, the observation of the forbidden (3) De lta(2)-(3) Phi(2) and (3) Delta(3)-(3) Phi(3) intercombination transit ions allowed the first experimental determination of the spin-orbit co nstants and a detailed characterization of both the (3) Delta and (3) Phi states through a matricial fitting of the data. Molecular paramete rs have been derived. (C) 1997 American Institute of Physics.