Abstract
Gas-phase ScO 2, YO 2, LaO 2 and the singly charged cations of these species are formed in endothermic reactions between MO + (M=Sc, Y, and La) and NO 2 in a guided ion beam mass spectrometer. The cross sections of these reactions are measured as a function of kinetic energy and are interpreted to give the following 0 K bond energies (in eV): D 0(OScO)=3.95±0.33, D 0(OYO)=4.14±0.22, D 0(OLaO)=4.20±0.33, D 0(OSc +O)=1.72±0.19, D 0(OY +O)=1.76±0.16, and D 0(OLa +O)=0.99±0.31. Values for the MO 2 ionization energies (in eV) are determined to be IE(ScO 2)=8.66±0.20, IE(YO 2)=8.23±0.16 and IE(LaO 2)=8.11±0.35. The differences between these values and estimates in the literature are discussed by considering the nature of the bonding in MO 2 and MO + 2.
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