BOND-ENERGIES OF TRANSITION-METAL DIMERS - TIZR, TINB, AND ZRV

The bond dissociation energies of TiZr, TiNb, and ZrV have been determ ined by the abrupt onset of predissociation in an extremely congested vibronic spectrum of these molecules. From these predissociation thres holds the dissociation energies are determined to be D-o(TiZr) = 2.183 +/- 0.001 eV, D-o(TiNb) = 3.092 +/- 0.001 eV, and D-o(ZrV) = 2.663 +/ - 10.003 eV. After making a correction for the promotion energies requ ired to prepare the atoms for bonding, the intrinsic bond energies of these molecules are compared and periodic trends in the bonding of the 3d-4d mixed transition metal dimers are discussed.