Guided ion-beam determination of the Co+-H2 bond dissociation energy

A guided ion-beam tandem mass spectrometer with a flow tube ion source is used to determine the 0 K bond dissociation energy of Co+-H2 from ligand exchange of CoCH4+ with D2 and from collision-induced dissociation (CID) of CoH2+ + Xe. Given D0(Co+-CH4) = 0.93 ± 0.06 eV determined in our labs, the endothermicity of the ligand exchange reaction provides D0(Co+-D2) = 0.74 ± 0.07 eV. The direct CID kof CoH2+ process yields D0(Co+-H2) = 0.82 ± 0.11 eV. After zero-point energy corrections, the average of these two results yields 0.76 ± 0.10 eV. This values agrees nicely with those determined by equilibrium methods and theory.