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Advances in Mathematical Physics
Volume 2012, Article ID 906414, 18 pages
Research Article

Relative-Velocity Distributions for Two Effusive Atomic Beams in Counterpropagating and Crossed-Beam Geometries

National Space Institute, Danish Technical University, Elektrovej, Building 327, 2800 Kongens Lyngby, Denmark

Received 27 February 2012; Revised 5 June 2012; Accepted 14 June 2012

Academic Editor: Ricardo Weder

Copyright © 2012 Jens Olaf Pepke Pedersen. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Formulas are presented for calculating the relative velocity distributions in effusive, orthogonal crossed beams and in effusive, counterpropagating beams experiments, which are two important geometries for the study of collision processes between atoms. In addition formulas for the distributions of collision rates and collision energies are also given.