Theory of evaporative cooling with energy-dependent elastic scattering cross section and application to metastable helium

Details Theory of evaporative cooling with energy-dependent elastic scattering cross section and application to metastable helium Theory of evaporative cooling with energy-dependent elastic scattering cross section and application to metastable helium

2003-12-09

arxiv.org/abs/cond-mat/0312223v1

PRA 70, 013404 (2004)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevA.70.013404

The kinetic theory of evaporative cooling developed by Luiten et al. [Phys. Rev. A 53, 381 (1996)] is extended to include the dependence of the elastic scattering cross section on collision energy. We introduce a simple approximation by which the transition range between the low-temperature limit and the unitarity limit is described as well. Applying the modified theory to our measurements on evaporative cooling of metastable helium we find a scattering length |a| = 10(5) nm.

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