Tungsten monocarbide, WC: Pure rotational spectrum and ¹³C hyperfine interaction

The J = 1 → 2 pure rotational transitions in the X ³Δ ₁v = 0) state of ¹⁸⁶W ¹²C and ¹⁸⁴W ¹²C were recorded using a pumpprobe microwave optical double resonance (PPMODR) technique and analyzed to give fine structure parameters. The field-free 17.62← X ³Δ ₁ (1, 0) bands of the W ¹³C isotopologues were recorded using laser induced fluorescence and analyzed to produce the ¹³C(I = 1/2) magnetic hyperfine parameter. Bonding in the 17.62(v = 1) and X ³Δ ₁v = 0) states is discussed and a comparison of the experimentally determined properties of the X ³Δ ₁v = 0) state with those predicted as a prelude to the electron electric dipole moment (eEDM) measurements J. Lee, E. R. Meyer, R. Paudel, J. L. Bohn, and A. E. Leanhardt, J. Mod. Opt. 56, 2005 (2009)10.1080/09500340903349930 is given.