Bond Dissociation Energies of the Diatomic Transition Metal Carbides CrC⁺, MoC⁺, and WC⁺

The results of our first measurement of the bond energies of CrC⁺, MoC⁺, and WC⁺ were reported. The bond energies are determined from the appearance potentials of M⁺ and MC⁺ （M=Cr, Mo, and W） in the photoionization / fragrnentation of M（CO）₆ with a synchrotron radi-ation sourc in the spectral range of 30 ~160 nm. Bond dissociation energies derived by this method are : D₀（Cr⁺-C） = （2.87±0.25） eV, D₀（Mo⁺-C） = （3.39 ± 0.30） eV, and D₀（W⁺-C） = （3.86±0.35） eV.