We have improved the theoretical triplet ground-state potential of I iq by means of an inverse perturbation analysis, and find that the diatomic scattering length for Li atoms in the F = 2, mF = 2 ground-state hyperfine level is negative. The consequences of this result for achieving Bose-Einstein condensation in a trapped ultracold Li gas sample are addressed.
We study collisions between dressed ground-state atoms in a full coupled-channel approach. In this way we examine collisions in the microwave trap, in the cryogenic hydrogen maser, and in the context of rf-induced evaporative cooling. The results for dressed H atoms confirm earlier results obtained within the so-called degenerate internal states approximation.
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