Guided ion-beam determination of the Co +-H 2 bond dissociation energy

Abstract

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 +-H 2 from ligand exchange of CoCH 4 + with D 2 and from collision-induced dissociation (CID) of CoH 2 + + Xe. Given D 0(Co +-CH 4) = 0.93 ± 0.06 eV determined in our labs, the endothermicity of the ligand exchange reaction provides D 0(Co +-D 2) = 0.74 ± 0.07 eV. The direct CID kof CoH 2 + process yields D 0(Co +-H 2) = 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.