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    HIGH RESOLUTION FOURIER TRANSFORM EMISSION SPECTROSCOPY OF YH AND YD.

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    Author Institution: Department of Chemistry, University of Arizona; Department of Chemistry, University of WaterlooThe electronic emission spectrum of YH and YD has been investigated in the 690 nm to 3 μm\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 H2H_{2} of D2D_{2} The observed bands have been classified into three different electronic transitions; C1Σ+X1Σ+, d0+(3Σ)X1Σ+C {^{1}\Sigma}^{+}-X {^{1}\Sigma}^{+}, \ d0 {^{+}}({^{3}\Sigma})- X{^{1}\Sigma}^{+} and C3Φa3ΔC^{3} \Phi-a^{3} \Delta. The d0+(3Σ)X1Σ+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 C1Σ+X1ΣC {^{1}\Sigma}^{+}-X {^{1}\Sigma}^{-} transition (up to v=3v^{\prime\prime} = 3 for YH and v=2v^{\prime\prime} = 2 for YD) provides improved equilibrium vibrational and rotational constants for the ground state of YH and YD. The excited C3Σ+C {^{3}\Sigma}^{+} state is involved in several perturbations
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