Collision-induced dissociation of lanthanide oxide ions in quadrupole ion traps: effects of bond strength and mass

Collision-induced dissociation (CID) rates are measured for a suite of lanthanide (plus yttrium) monoxide ions stored in a quadrupole ion trap. Yttrium, neodymium, and gadolinium oxides, having the same nominal dissociation energy (D0 ≈ 735 kJ mol−1) but different masses, provide an empirical correction of −1.2 s−1 amu−1 for the measured CID rates. The CID rate correction enables the correlation of bond dissociation energy with CID rate, allowing quantitative determinations of bond dissociation energies for lanthanide metal monoxide ions. For bond dissociation energies in the range of 567–849 kJ mol−1, mass corrected rates range from 50 to 120 s−1. The calibration sensitivity is equivalent to 5 kJ mol−1 s−1, and the measurement precision is ∼25 kJ mol−1. Bond energy determinations are found to agree with the average values reported for lanthanide oxide ions. (Int J Mass Spectrom 216 (2002) 85–93) © 2002 Elsevier Science B.V. All rights reserved.