S-Wave Scattering Properties for Na–K Cold Collisions

Scattering properties of ultracold atoms are sensitive to the interatomic potential. Based on the accurate triplet least-bound state energy, we calculate the triplet s-wave scattering length for ²³Na–⁴⁰K. The scattering length is ?814.1_?31.3⁺²⁹ a₀ with a₀ being the Bohr radius. By using the mass scaling method, those scattering lengths are also obtained for ²³Na–⁴¹K and ²³Na–³⁹K. The degenerate internal state approximation is used to estimate the scattering data of atoms colliding in different spin states.