The Mean Free Path and the Collision Cross Section

  • D. A. Frank-Kamenetskii


An uncharged particle can only have its direction of motion changed by a collision. Between collisions the particle moves in a straight line with constant velocity v over a distance given by
$$ l = \vartheta \tau $$
where τ is the time between collisions. The diffusion coefficient can then be written
$$ D = l\vartheta $$


Diffusion Coefficient Path Length Free Path Constant Velocity Linear Dimension 
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Copyright information

© Plenum Press, New York 1972

Authors and Affiliations

  • D. A. Frank-Kamenetskii
    • 1
  1. 1.Kurchatov Institute of Atomic EnergyAcademy of Sciences of the USSRMoscowRussia

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