Alkali–Alkali Glory Scattering in the Σ3 State

The velocity dependence of the total cross section for the scattering of 7Li by Na, K, Rb, and Cs has been measured in a velocity range from about 1–4.5 km/sec, and that for Na–Cs scattering from 1–3 km/sec. The observed glory undulations are due to the Σ3 state of the diatom. A Lennard-Jones (8,6) potential is assumed. The product of the potential parameters εrm were obtained, and for the lithium scattering, the separated parameters ε and rm were estimated. Independent of potential model, the number of extrema indicates that the minimum number of bound states for the Li–Na, Li–K, Li–Rb, Li–Cs, and Na–Cs triplet states is 3, 4, 5, 6, and 7, respectively. The Na–Cs results are not consistent with previous results.