# JET-COOLED ELECTRONIC SPECTROSCOPY OF ZrC

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 Title: JET-COOLED ELECTRONIC SPECTROSCOPY OF ZrC Creators: Merer, A. J.; Peers, J. R. D.; Rixon, Scott J. Issue Date: 2002 Publisher: Ohio State University Abstract: Zirconium monocarbide is produced in high yield from the reaction of laser- ablated Zr metal with a helium/methane (1%) gas mixture under supersonic free jet conditions. The ground state is $X^{1}\Sigma^{+}$, but the low-lying $a^{3}\Sigma^{+}$ state has also been identified by high-resolution laser-induced fluorescence; this has $T_{0} = 690 cm^{-1}$ and $w_{e} = 885 cm^{-1}$. Molecular constants have been derived for $^{90}ZrC$ (51.45% natural abundance) for both states; the corresponding constants of the minor isotopomers $^{92}$ZrC (17.15%) and $^{94}$ZrC (17.38%) have also been determined for $a^{3}\Sigma^{+}$, and scale isotopically within experimental error. The principal electronic bands in the visible region form a strongly perturbed $^{3}\Pi_{r} - a^{3}\Sigma^{+}$ system, of which the origin band has been analysed in detail. The perturbations in the $^{3}\Pi_{r}$ state appear to be caused by singlet states. Description: Author Institution: Department of Chemistry, University of British Columbia; Department of Physics and Astronomy, University of British Columbia URI: http://hdl.handle.net/1811/20552 Other Identifiers: 2002-TA-10