By A. M. Howatson (Auth.)

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Cross-sections for collisions between neutrals are not easily measured directly but are less often required. 6. Extensive data on elastic cross-sections, especially for collisions by electrons, are available(2) over a wide range of energy. 3). Momentum transfer by electrons in actual elastic collisions is rather less than total; that is, there is generally forward scatter (sometimes called persistence of velocities) as opposed to the isotropic scattering of the elastic-sphere theory. The error is not very large and total momentum transfer is often assumed.

216. HASSE, H. R. Phil. Mag. 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.

3). Momentum transfer by electrons in actual elastic collisions is rather less than total; that is, there is generally forward scatter (sometimes called persistence of velocities) as opposed to the isotropic scattering of the elastic-sphere theory. The error is not very large and total momentum transfer is often assumed. eI(l - cos φ) which can be evaluated from the angular distribution of scattered electrons (like qeb energy-dependent). From this there follow immediately a mean free path Am and collision frequency vm.

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