Knowledge Bank

The bond dissociation energies of $Ti2-,V2+,Co2+$, and $Co3-$ have been measured from the sudden onset of predissociation in the photodissociation spectra of these molecules, yielding values of $D00(Ti2+)=2.435\pm 0.002$ eV, $D00(V2+)=3.140\pm 0.002$ EV, $D00(Co+$ eV. These values are in good agreement with values previously determined from collision-induced dissociation experiments. General criteria for interpretation of predissociation thresholds as bond dissociation energies and periodic trends in the bonding of the 3d transition metal diatomic neutrals and monocations are discussed.