Columnar Ionization

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Abstract
The ionization collected from single alpha-particles has been measured as a function of the angle between the path of the particle and the direction of the electric field. Data obtained for electric field strengths of 8, 100 and 500 volts per cm and for air pressures of one and two atmospheres are given. These results have been compared with curves based on the theory given by Jaffé. The agreement between theory and experiment is satisfactory and shows clearly that for low field strengths the loss of ions by recombination is appreciable even for large angles between particle path and electric field. In contrast with values of the recombination coefficient given by Jaffé, it is indicated in the present work that previously accepted values for this quantity are correct. A description of the FP-54 Pliotron circuit which has been used for this work is given.

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