THE NUCLEAR SPIN-SPIN COUPLING IN N2 AND CO

Molecules with multiple bonds are challenging for computations of nucl ear spin-spin coupling constants. This can be referred to the asserted importance of non-contact mechanisms, to sharp geometry variations as well as to the handling of the electronic structure problem. We emplo y a recently developed multi-configuration linear response theory for calculations of nuclear spin-spin coupling constants in molecular nitr ogen and carbon monoxide and explore systematically the role of correl ation for the Fermi contact as well as the other main non-contact mech anisms.