Sequential bond energies of Ag+(H2O)n and Ag+(dimethyl ether)n, n=1-4, determined by threshold collision-induced dissociation

Collision-induced dissociation (CID) of the Ag+(H2O)(n) and Ag+(dimethyl ether), complexes for n = 1-4 is studied using kinetic energy-dependent guided ion beam mass spectrometry. In all cases, the primary products are endothermic loss of an intact neutral ligand from the complex. The cross-section thresholds are interpreted to yield 0 and 298 K bond energies after accounting for the effects of multiple ion-molecule collisions, internal energy of the complexes, and unimolecular decay rates. These values are compared favorably with previous experimental values for the water complexes and with ab initio theoretical values for all eight complexes. Our results are also compared with. the analogous copper and alkali metal ion complexes, previously studied. Although Ag+ and Cu+ both have S-1(3d(10)) ground state electronic configurations, the comparison shows different trends for Ag+ because of its larger ionic size. (C) 2003 Elsevier Science B.V All rights reserved.