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Collision cross sections for the thermalization of cold gases.

Frye, M.D. and Hutson, J.M. (2014) 'Collision cross sections for the thermalization of cold gases.', Physical review A., 89 (5). p. 52705.


The collision cross section that controls thermalization of gas mixtures is the transport cross section σ(1)η and not the elastic cross section σel. The two are the same for pure s-wave scattering but not when higher partial waves contribute. We investigate the differences between them for prototype atomic mixtures and show that the distinction is important at energies above 100μK for LiYb and 3μK for RbYb and RbCs. For simple systems, both σ(1)η and σel follow universal energy dependence that depends only on the s-wave scattering length when expressed in reduced length and energy units.

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Publisher statement:Reprinted with permission from the American Physical Society: Phys. Rev. A 89, 052705 © (2014) by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:No date available
Date deposited:11 July 2014
Date of first online publication:May 2014
Date first made open access:No date available

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