A Coulomb collision is the deflection or energy exchange of charged particles through their electric interaction. In a dilute plasma, the cumulative effect of many small-angle encounters controls transport and interspecies thermal equilibration.
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Coulomb collision refers to the process in which charged particles, such as electrons or ions, interact with each other through the Coulomb force, which is the electromagnetic force between charged particles. This interaction can lead to scattering events where the trajectory and energy of the charged particles can change due to their mutual repulsion (in the case of like charges) or attraction (in the case of opposite charges).