# LASER VELOCITY MODULATION SPECTROSCOPY OF THE $^{3}\Delta (3d4s) - X^{3}\Phi(3d^{2})$ VISIBLE SYSTEM OF IN $TiCl^{+}$ THE VISIBLE RANGE AND CHARACTERIZATION OF THE SPIN-ORBIT STRUCTURE.

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 Title: LASER VELOCITY MODULATION SPECTROSCOPY OF THE $^{3}\Delta (3d4s) - X^{3}\Phi(3d^{2})$ VISIBLE SYSTEM OF IN $TiCl^{+}$ THE VISIBLE RANGE AND CHARACTERIZATION OF THE SPIN-ORBIT STRUCTURE. Creators: Focsa, Cristian; Dufour, C.; Pinchemel, B.; Bachir, I. Hadj; Huet, T. R. Issue Date: 1997 Publisher: Ohio State University Abstract: A single mode cw dye laser along with velocity modulation detection was used lo record the absorption spectrum of the visible system of TiCl produced in an ac glow discharge between 17 100 and $18 600 cm^{-1}$ with a gas mixture of He/$TiCl_{1}$,. The translational temperature can be estimated to be about 800 K inducing narrow line shape. The rotational structure of the (0,0) and (1,0) vibrational bands has been observed and fully analysed for the main isotopomer $Ti^{35}Cl^{+}$ well as the (0,0) and (1,0) bands for $Ti^{37}Cl^{+}$. A set of molecular parameters has been obtained which includes the spin-orbit parameters thanks to the observation of the forbidden. A set of and molecular parameters has been obtained which includes the spin-orbit parameters thanks to observation of the forbidden $^{3}\Delta_{2} - ^{3}\Phi_{2}$ and $^{3}\Delta_{2} - ^{3}\Delta_{3}$ intercombination $transitions^{m}$. The $X^{3}\Phi(3d^{2})$ state was found to be perturbed. Additional spectra have been recorded with a better sensitivity in the same spectral range. In this communication we will report the observation of new bands. Among them, hoi bands have already been identified, involving the $\nu^{\prime\prime} =1$ levels. The detailed analysis of the spectrum in this range is currently performed in order to determine a set of unperturbed molecular parameters for the ground state. Efforts are also La progress for producing other Ti -containing ions by introduction of a reactive gas into the discharge, in relation with the astrophysical interest of Ti containing compounds. Description: $^{m}$C. Focsa, C. Dufour, B. Pinchemel. I Hadj Bachir, and T.R. Huet J. Chem. Phys. (submitted for publication) Author Institution: Laboratpoire de Dynamique Moleculaire et Photonique, Centre d'Etudes et de Recherches Lasers et Applications, Universite de Lille; Laboratoire de Spectroscope Hertzienne, Centre d' Etudes et de Recherches Lasers et Applications, Universite de Lille URI: http://hdl.handle.net/1811/13797 Other Identifiers: 1997-FB-14