LASER SPECTROSCOPY OF THE $^4\Gamma$ - X$^4\Phi$ TRANSITION IN TITANIUM HYDRIDE, TiH

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A gas phase study of the $^{4}\Gamma_{2.5}$ - A$^{4}\Phi_{1.5}$ (0, 0) band in the astrophysically important titanium hydride molecule, TiH, has recently been undertaken. Low resolution dispersed fluorescence spectra of TiH and TiD have yielded information on the vibrational structure. A high resolution study at a linewidth of $\approx$40 MHz has shown doubling due to resolved hydrogen hyperfine structure in the main $^{48}$TiH (74\% abundance) isotopologue, and the much weaker $^{46}$TiH (8\%) and $^{50}$TiH (5\%) species. Titanium hyperfine structure was also resolved in the weak $^{47}$TiH (8\%, I = 2.5) and $^{49}$TiH (5\%, I = 3.5) isotopologues. The magnetic tuning properties of TiH have been examined by studying the Zeeman effect on the low-J lines. The analysis is presently in progress and the latest results will be presented at the symposium.

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Author Institution: Centre for Laser Atomic and Molecular Sciences and Physics; Department, University of New Brunswick, Fredericton, NB E3B 5A3; Canada; Department of Chemistry and Biochemistry, Arizona State; University, Tempe, Arizona 85287-1604

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