The laser excitation spectrum of tungsten methylidyne, WCH, has been recorded in the 12 000–15 400 cm− 1 region. A total of 14 vibronic bands of WCH and 16 bands of WCD have been observed in this region. Rotational analysis shows that the ground state is X̃3/2 (2Δ), with the substitution structure r 0 (W≡ C)= 1.73665 Å and r 0 (C–H)= 1.0765 Å. The excited vibronic levels have been assigned, on the basis of their WCH/WCD isotope shifts and ...
