# $A^{1}\Sigma^{+} - \bar{X}^{1}\Sigma^{+}$ ELECTRONIC TRANSITION OF YOH IN THE VISIBLE REGION

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 Title: $A^{1}\Sigma^{+} - \bar{X}^{1}\Sigma^{+}$ ELECTRONIC TRANSITION OF YOH IN THE VISIBLE REGION Creators: Athanassenas, K.; Kingston, C. T.; Merer, A. J.; Peers, J. R. D.; Gillett, D. A. Issue Date: 1997 Publisher: Ohio State University Abstract: Excitation spectra of the new molecules YOH and YOD have been recorded in the 500-625 nm wavelength region by laser-induced fluorescence, following reaction of laser-ablated yttrium with $H_{2}O$ or $D_{2}O$ under supersonic jet-cooled molecular beam conditions. Rotational analyses of $^{1}\Sigma^{+} - \bar{X}^{1}\Sigma^{+}$ bands near 540 nm at high resolution gave the following substitution structure for the ground state: $\tilde{X}\Sigma^{-}: r(Y-O) = 1.948\; {\textrm{\AA}};\; r(O-H) = 0.92_{1} \;\textrm{\AA}.$ Wavelength-resolved fluorescence spectra have given the ground state vibrational frequencies $YOH (YOD): \nu^{2},\; bend = 314 (247)\;cm^{-1}; \nu^{3},\; YO\;stretch = 674 (654)cm^{-1}$ No evidence for the $\nu_{1}$ (OH stretch) mode was observed. Very complicated weak structure at the long wavelength end may possibly correspond to a singlet-triplet transition. Description: Author Institution: Department of Chemistry, University of British Columbia; Department of Chemistry, Lumbda Physik, Inc. URI: http://hdl.handle.net/1811/14014 Other Identifiers: 1997-TA-03