The Mean Free Path and the Collision Cross Section
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
where τ is the time between collisions. The diffusion coefficient can then be written
$$ l = \vartheta \tau $$
$$ D = l\vartheta $$
KeywordsDiffusion Coefficient Path Length Free Path Constant Velocity Linear Dimension
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
© Plenum Press, New York 1972