Abstract
Ab initio metods have been employed to investigate first row transition metal hydrides and helides of form: TMHn+ (where n = 0–2) and TMHen+ (where n = 1–3), respectively. Multi-configurational SCF and IC-MRCI methods have been used, along with all-electron ROHF-UCCSD(T) methods, in order to compare trends in the bonding of these series. Equilibrium geometries, dissociation energies and vibrational frequencies have been determined for the low-lying electronic states. A comparison with the diatomic first row transition metal hydrides illustrates the limit of isoelectronic approaches and so further highlights the unique binding properties of helium.
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