Abstract
Resonant two-photon ionization spectroscopy has been used to study the diatomic transition-metal carbide, WC. A low-resolution scan revealed a five-member vibrational progression beginning with the 0-0 band at 17 585 cm−1. Analysis of this progression yielded a vibrational frequency of ωe′(184W12C)=752.6(4.9) cm−1 and a bond length of re′(184W12C)=1.747(4) Å. Several unassigned bands were also rotationally resolved and analyzed. All of the observed bands are Ω′=2←Ω″=1 transitions, confirming the predicted ground state of Δ13 arising from a 14σ28π415σ24δ116σ1 configuration. The measured line positions in these bands were simultaneously fitted to provide B0″=0.509 66(10) cm−1 for W12184C, corresponding to r0″(184W12C)=1.713 5(2) Å. These values are corrected for spin-uncoupling effects in the ground state and represent our best estimate of the true bond length of WC. Dispersed fluorescence studies provide the ground-state vibrational constants of ωe=983(4) cm−1 and ωexe=11(1) cm−1, and have also permitted the low-lying [1.2] 3Δ2 and [4.75] states to be located and characterized. These results on WC are discussed in relation to the isovalent molecule MoC and other transition-metal carbides.
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