FOURIER TRANSRORM EMISSION SPECTROSCOPY OF THE $A^{1}\Sigma^{-}- X^{1}\Sigma^{-}$ SYSTEM OF YN.
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Date
1994
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Ohio State University
Abstract
The electronic emission spectrum of YN has been observed in the 2.3-2.6 $\mu$ spectral region using a Fourier transform spectrometer. The bands were excited in a yurium hollow cathode lamp in the presence of a trace of molecular nitrogen. The observed bands, with origins at 3882.7625(4), 4229.0457(3), 4528. 6562(46), 4798.5145(13), 5049.4429(20) and 5281.2129(27)$ cm^{-1}$, have been assigned as the 0-0, 1-1, 3-3, 4-4 and 5-5 vibrational bands, respectively, of the $A {^{1}\Sigma^{+}} - X {^{1} \Sigma^{+}}$ electronic transition. The principal equilibrium constants for the ground state obtained from this analysis are $B_{e}{^{\prime\prime}} = 0.42815(24) cm^{-1} r_{e}{^{\prime\prime}}=1.80405(50)$ {\AA} and the corresponding excited state values are $B_{e}^{\prime}=0.42311(30) cm^{-1}$ and $r_{e}=1.81477(64)$ {\AA}. This work represents the first observation of the YN molecule.
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Author Institution: Department of Chemistry, University of Arizona; Department of Chemistry, University of Waterloo