collision diameter

collision diameter

[kə′lizh·ən dī‚am·əd·ər]
(physical chemistry)
The distance between the centers of two molecules taking part in a collision at the time of their closest approach.
References in periodicals archive ?
Relative to rigid spheres with collision diameter s for low-energy collisions, Lennard-Jones molecules have a slightly smaller cross-section for high-energy collisions that are almost head-on, due to strong repulsive forces.
for square-well potentials characterized by collision diameter [[sigma].
k] collision diameter for the Lennard-Jones 6-12 intermolecular potential
i] represent purecomponent collision diameters and potential well depths, respectively, and an empirical averaging procedure is employed to estimate these parameters for collisions between dissimilar molecules.

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