Gas phase interactions of transition metals and metal oxides with carbon monoxide and carbon dioxide: A guided ion beam stud

The kinetic energy dependences of the reactions M+ + CO 2 and MO+ + CO and the collision-induced dissociation (CID) reactions M+(CO2) or OM+(CO) + Xe, where M = V, Y, YO, Zr, ZrO, Nb, NbO, Mo, and MoO, are studied by guided ion beam mass spectrometry. From all of these reactions, we are able to obtain thermochemistry for the product ions generated by analyzing the energy dependence of the cross sections. For the reactions with CO2, complex cross sectional behavior is observed for the most abundant product ion, MO +. Analysis of the energy dependence of these cross sections allows speculative assignments of excitation energies to excited state MO +. From the reactions with CO, the dominant product in all systems is M+. For both the reaction with CO2 and the reaction with CO, spin conservation is seen to be a very strong influence on the efficiency of the reactions. For the CID reactions, simple ligand loss dominates all of the systems and no rearrangement products are observed, except for M = NbO.