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By A. M. Howatson (Auth.)

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1, 139 (1926). ENGEL, A. VON. Ionized Gases. Clarendon Press, Oxford, 1965, p. 125. JEANS, J. H. Kinetic Theory of Gases. Cambridge, 1940, p. 198. HASTED, J. B. Physics of Atomic Collisions. Butterworths, London, 1964, p. 19. GENERAL BIBLIOGRAPHY BORN, M. Atomic Physics. Blackie, London, 1962. BROWN, S. C. Basic Data of Plasma Physics, 1966. T. Press, London, 1967. LOEB, L. B. Basic Processes of Gaseous Electronics. California, 1955. ENGEL, A. VON. Ionized Gases. Clarendon Press, Oxford, 1965. FLÜGGE, S.

Since the mean free path of electrons is frequently greater than that of ions, and their random velocities much greater, it follows from eqn. 21) that De > D{. In a partly ionized gas, therefore, electrons diffuse more rapidly than ions and so tend to cause charge separation. We shall shortly consider this in some detail. 2. The Einstein Relation The diffusion of charged particles is related to their mobility: both result in mass motion, described by a drift velocity and caused in the one case by the net effect of unbalanced collision forces (concentration gradient), in the other by an electric field.

The average kinetic energy is then constant and so also is the average directed velocity, the value of which is then known as the drift velocity of the electron. It is comparable with the terminal velocity attained by a body passing through a viscous fluid under the action of a constant force. The collisions experienced by the electron, which serve to fix this limit to the velocity it acquires from the field, have the macroscopic effect of viscous friction, which here determines the resistivity of the ionized gas.

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