# HIGH RESOLUTION LASER SPECTROSCOPY OF TITANIUM MONOBROMIDE AND HAFNIUM MONOFLUORIDE.

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 Title: HIGH RESOLUTION LASER SPECTROSCOPY OF TITANIUM MONOBROMIDE AND HAFNIUM MONOFLUORIDE. Creators: Adam, A. G.; Hopkins, Scott Issue Date: 2002 Publisher: Ohio State University Abstract: High resolution laser spectra of TiBr and HfF have been taken in the blue and green-yellow regions of the spectrum. The group IV monohalide molecules were produced by laser vaporization of their respective metal rods, followed by reaction with $CH_{3}Br$ or $SF_{6}$ in a pulsed supersonic jet. The electronic transition in TiBr has been identified as $^{4}\Gamma - ^{4}\Phi$, consistent with that of TiCl and TiF; however, a second, higher energy transition (tentatively assigned as $^{4}\Phi - {^{4}}\Phi$) has also been observed, overlapping the first. We have managed to assign a number of the subbands and we will provide a case (a) analysis of the $^{4}\Gamma - {^{4}}\Phi$ transition. Results for the second electronic transition will also be discussed. The transition in HfF is not, as of yet, determined. There are two transitions lying close to each other at $17528 cm^{-1}$ and $17432 cm^{-1}$. The most intense subband (at $17,528 cm^{-1}$) shows a strong Q-branch, medium strength R-branch and weak P-branch, indicative of a $\Delta \Lambda = +1$ type transition. This is in contrast with the $\Delta \Lambda = 0, {^{2}}\Delta_{3/2} - {^{2}}\Delta_{3/2}$ transition recently observed for HfCl$^{a}$. Work on this molecule is continuing and the results will be discussed. Description: $^{a}$ R. S. Ram, A. G. Adam, A. Tsouli, J. Lievin, and P. F. Bernath, J. Mol. Spectrosc. 202, 116 (2000). Author Institution: Department of Chemistry, University of New Brunswick URI: http://hdl.handle.net/1811/20451 Other Identifiers: 2002-RB-11