ELECTRONIC SPECTROSCOPY OF WC FROM 17,500 to $24,000 cm^{-1}$
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Date
2001
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Publisher
Ohio State University
Abstract
Resonant two-photon ionization spectroscopy has been used to study the diatomic molecule WC. A low resolution scan revealed a five member vibrational progression beginning at $17 585 cm^{-1}$ with the $\nu_{00}$ transition. Analysis of this progression yielded a vibrational frequency of $\omega^{\prime}_{e}(^{184}W^{12}C) = 752.6(4.9) cm^{-1}$ and a bond length of $r^{\prime}_{e}(^{184}W^{12}C) = 1.747(4) \AA$. In addition, several unassigned bands were rotationally resolved. Interestingly, all of the observed excited states have $\Omega^{\prime} = 2$. All of the rotationally resolved transitions were fit simultaneously to produce the best possible fit of the ground state. Assignment of these bands confirmed a ground state of $^{3}\Delta_{1}$ from a $14\sigma^{2}8\pi^{4}15\sigma^{2}4\delta^{1}16\sigma^{1}$ configuration and determined the ground state as $r^{\prime\prime}_{0}(^{184}W^{12}C) = 1.7143(2) \AA$. Dispersed fluorescence studies to elucidate the ground and low-lying excited states will also be reported. These results on WC are compared to the results of studies on MoC and other transition metal carbides.
Description
Author Institution: University of Utah; Department of Chemistry, University of Utah