Evaluation of the Atomic Polarisabities of Li And K using the Long Range Lik+ Electronic States Behaviour

A vibrational level spacing analysis of the lowest electronic states of the LiK⁺ molecule dissociating into Li(2s, 2p, 3s, 3p, 3d, 4s and 4p) + K⁺ and Li⁺ + K(4s, 4p, 5s, 3d, 5p, 4d, 6s) has been performed using the usual WKB semiclassical approximation. Accurate long range potentials have been determined and allowing for the determination of all vibrational levels near the dissociation limit, the Li and K atomic polarisabilities, the number of trapped vibrational levels, and the vibrational turning points.