The electron ionization coefficient α/p0 (cm×Torr)−1 has been measured over an E/p0 (volts/cm×Torr) range from 20 to 100 in deuterium subjected to various purification procedures. The results obtained lie slightly below those previously reported by Rose; however, the agreement is within the combined experimental error. Comparison is also made with the measurements of the ionization frequency νi/p (sec×Torr)−1 of Cottingham and Buchsbaum. The present results, at a given E/p0 value, lie above their data. The discrepancy between the ac and dc results is discussed.
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Rork et al. (1964) studied this question.
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