The ionization coefficient a/p was measured across a strong magnetic field. Data were obtained by varying the gap in a cylindrical geometry. Measurements were made for B/p up to 4000 gauss/mm Hg and for an effective E/p' less than 150. A theoretical expression of Blevin and Haydon is shown to fit the points well over a limited range of values. The effective collision frequency that makes the theory fit is much smaller than the actual average collision frequency. Analysis shows that this discrepancy results from deviations in the distribution function.
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