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The monopositive scandium and titanium carbides, ScC+ and TiC+, have been studied by multireference methods coupled with quantitative basis sets. We have constructed potential energy curves for the ground and twelve low-lying excited states for both species, focusing on dissociation energies and bonding mechanisms. We have found that the ground states of ScC+ and TiC+ are of 3Π and 2Σ+ symmetries, with binding energies (D0) of 68.8 (71.5) and 85.2 (86.7) kcal/mol at the MRCI (MRCI+Davidson correction) level of theory. These values are compared favorably with the corresponding experimental findings, D0(ScC+) = 77.0 ± 1.4 and D0(TiC+) = 93.4 ± 5.5 kcal/mol.

Electronic Structure of Scandium and Titanium Carbide Cations, ScC+and TiC+. Ground and Low-Lying States

Electronic Structure of Scandium and Titanium Carbide Cations, ScC⁺and TiC⁺. Ground and Low-Lying States