Atomic dynamics in evaporative cooling of trapped alkali atoms in strong magnetic fields

Details Atomic dynamics in evaporative cooling of trapped alkali atoms in strong magnetic fields Atomic dynamics in evaporative cooling of trapped alkali atoms in strong magnetic fields

1999-10-27

arxiv.org/abs/physics/9910043v1

Phys. Rev. A 62, 025402 (2000)

Physics

Atomic Physics

9 pages, RevTex, eps figures embedded

Scientific paper

10.1103/PhysRevA.62.025402

We investigate how the nonlinearity of the Zeeman shift for strong magnetic fields affects the dynamics of rf field induced evaporative cooling in magnetic traps. We demonstrate for the 87-Rb and 23-Na F=2 trapping states with wave packet simulations how the cooling stops when the rf field frequency goes below a certain limit (for the 85-Rb F=2 trapping state the problem does not appear). We examine the applicability of semiclassical models for the strong field case as an extension of our previous work [Phys. Rev. A 58, 3983 (1998)]. Our results verify many of the aspects observed in a recent $^{87}$Rb experiment [Phys. Rev. A 60, R1759 (1999)].

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