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Collision cross sections for the thermalization of cold gases

Frye, M.D.; Hutson, J.M.

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M.D. Frye


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.


Frye, M., & Hutson, J. (2014). Collision cross sections for the thermalization of cold gases. Physical Review A, 89(5), Article 052705.

Journal Article Type Article
Publication Date May 1, 2014
Deposit Date May 14, 2014
Publicly Available Date Jul 11, 2014
Journal Physical Review A
Print ISSN 1050-2947
Electronic ISSN 1094-1622
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 89
Issue 5
Article Number 052705


Published Journal Article (631 Kb)

Copyright 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.

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