The Constitution of Gaseous Ions

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Abstract
Mobilities of various groups of ions in dry and moist air.—Using the Franck modification of the Rutherford alternating current method, with the plate and gauze accurately parallel and 2.5 cm apart, current-voltage curves were obtained as the 52 cycle voltage was increased from 200 to 500 volts. Previous experiments have shown the presence of four predominating types of positive ions with mobilities of 2.04, 1.73, 1.52 and 1.34. The curves now reproduced show periodic inflections about every 10 volts which indicate intervening groups making some twenty groups of ions with mobilities varying from 2.24 to 1.34. These values agree closely with those computed according to J. J. Thomson's theory for clusters of from 15 to 36 water-molecules. In dry air the groups with the lower mobilities are less prominent. Other experimental evidence is cited in favor of the cluster theory as opposed to the small ion theory of ions. Loeb's criticism of the author's work is discussed and it is shown that there is no real divergence between these results and those of Loeb.

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