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Microwave techniques are applied to the measurement of the recombination between electrons and positive ions. The measured recombination coefficients for monatomic gases range from 1. 710^-8 cc/ion-sec. for helium to 310^-7 cc/ion-sec. for argon. The recombination coefficients for diatomic gases range from 2. 510^-6 cc/ion-sec. for hydrogen to 2. 810^-7 cc/ion-sec. for oxygen. At electron temperatures of 300^, the recombination is found to be independent of pressure for the monatomic gases. A pressure dependence is observed in diatomic gases, the recombination increasing with increasing pressure in nitrogen and oxygen.
Biondi et al. (Thu,) studied this question.