The "elastic" Scattering of Degenerate Atoms

Ning-Yi Du, Bo Gao

Jicai Zhang, Zunlue Zhu, Yufang Liu +1 more

We investigate the elastic scattering properties of strontium atoms at ultracold temperatures. The scattering parameters, such as s-wave scattering lengths, effective ranges and p-wave scattering lengths, are calculated for all stable isotope combinations of Sr atoms by the quantal method and semiclassical method, respectively. Good agreements are obtained. The scattering parameters are very sensitive to small changes of the reduced mass. Due to the repulsive interisotope and intraisotope s-wave scattering length and large elastic cross sections, 84 Sr— 86 Sr mixture is a good candidate to realize Bose—Bose quantum degenerate atomic gases.

J. Callaway, P. S. Laghos

Juha Javanainen

We investigate numerically resonance fluorescence in angular-momentum degenerate-atomic-level schemes. The spectrum of scattered light may contain quasi-elastic peaks originating from Raman transitions between Stark-shifted Zeeman states. Possible experiments with the D2 line of sodium are discussed.

Zhang Ji-Cai, Zhu Zun-L uuml e, Sun Jin-Feng

Based on the accurate singlet and triplet state interatomic potentials for Na2, a theoretical study of elastic scattering properties of sodium atoms at ultracold temperatures is reported in this paper. The s-wave scattering length, effective range, the p-wave scattering length and the number of bound states are calculated. The singlet and triplet elastic scattering cross section between sodium aotms at ultracold temperatures are dominated by s-wave scattering, and shape resonances occur with collision energy increasing. There exist pronounced f-wave and i-wave shape resonances for the singlet and triplet cross section. In addition, s-wave scattering length is calculated by using the degenerate internet state approximation for selected hyperfine states of sodium atoms. The results are in agreement with calculated values obtained by close-coupling method.