Calculation of Scattering Parameters for Ultracold K–Cs Elastic Collisions

A theoretical study of elastic scattering properties in a mixture of 39K and 133Cs atoms at cold and ultracold temperatures is reported in this paper. Based on the new constructed accurate singlet X 1∑+ and triplet a 3∑+ states interatomic potentials for 39K133Cs mixture, the interspecies s-wave scattering lengths and the p-wave scattering volumes are calculated by the variable phase method and the semiclassical method, respectively. Good agreement between two methods is obtained. The mass dependence of the scattering data by considering all isotopomers is explored, and the numbers of bound states supported by the molecular potentials for each isotopomer are also calculated.