HIGH RESOLUTION FOURIER TRANSFORM EMISSION SPECTROSCOPY OF YH AND YD.

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1994

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Ohio State University

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The electronic emission spectrum of YH and YD has been investigated in the 690 nm to 3 $\mu m$ spectral region using a Fourier transform spectrometer. The YH and YD bands were excited in an yttrium hollow cathode lamp operated with neon gas and a trace of $H_{2}$ of $D_{2}$ The observed bands have been classified into three different electronic transitions; $C {^{1}\Sigma}^{+}-X {^{1}\Sigma}^{+}, \ d0 {^{+}}({^{3}\Sigma})- X{^{1}\Sigma}^{+}$ and $C^{3} \Phi-a^{3} \Delta$. The $d0 {^{+}}({^{3}\Sigma})- X{^{1}\Sigma}^{+}$ transition of YD could not be identified due to its very weak intensity. The rotational analysis of several bands of the $C {^{1}\Sigma}^{+}-X {^{1}\Sigma}^{-}$ transition (up to $v^{\prime\prime} = 3$ for YH and $v^{\prime\prime} = 2$ for YD) provides improved equilibrium vibrational and rotational constants for the ground state of YH and YD. The excited $C {^{3}\Sigma}^{+}$ state is involved in several perturbations.

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Author Institution: Department of Chemistry, University of Arizona; Department of Chemistry, University of Waterloo

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