On the Hyperpolarizability of the Lithium Dimer

All independent components of all electric polarizability and hyperpolarizability tensors up to the fourth rank have been calculated near the Hartree-Fock limit for L i2(l a 2 l a l 2 a l , X l 27+). Many of the molecular properties reported in this paper appear for the first time in the literature. Our values for the isotropic components of the C, B and y hyperpolarizabilities are 1487 e2 öo Eb l, — 490 x 102 e3 E^2 and 510.5 x 103 e4 aft E^3 respectively.