Australian Journal of Physics Australian Journal of Physics Society
A journal for the publication of original research in all branches of physics

Zero-field Mobility for Electrons in Dry and Humid Air

HB Milloy, ID Reid and RW Crompton

Australian Journal of Physics 28(2) 231 - 234
Published: 1975


The zero-field mobility of electrons in dry and humid air at 294 K has been studied with drift tube techniques. For air containing 1.5 % water vapour (50 % relative humidity) the zero-field mobility was found to be 8.4 ± 0.2 X 105 cm s−l Td−l. The zero-field mobility of electrons in dry air (4.7 ± 0.2 x 106 cm s−l Td−l) was deduced from measurements in which small quantities of CO2 Were added to reduce the electron energy. It is estimated that the momentum transfer cross section for electron–oxygen collisions, at near thermal energies, is at least four times smaller than it is for electron–nitrogen collisions.

© CSIRO 1975

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