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The Mobility Distribution and Rate of Formation of Negative Ions in Air

Published online by Cambridge University Press:  24 October 2008

J. L. Hamshere
J. L. Hamshere
Affiliation:
Trinity College.
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Extract

A modification of the alternating field method of measuring ionic mobility in a gas gives an experimental curve showing upper and lower limits to k. From this a distribution curve is derived, which has a calculable resolving power.

The mobility of negative ions in dry air shows a continuous distribution between the limits 2·15 and 1·45, with a peak value about 1·8.

At low pressures the current is resolved into ions and free electrons. From the relative numbers reaching the electrometer it is found that the electron makes an average number 9·4. 104 collisions before capture, independent of field strength and pressure, and therefore independent of the electron speed over a range W = 2×105 to W = 7×105.

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 25 , Issue 2 , April 1929 , pp. 205 - 218
Copyright
Copyright © Cambridge Philosophical Society 1929

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