Abstract
The reduced mobility of K+ ions in He, Ne, Ar, H2 and N2 and in mixtures of He-Ne, Ne-Ar and H2-N2 has been measured at 293 K over the range 20<or=E/N(Td)<or=100 using the Bradbury-Nielsen time-of-flight technique. A theory has been developed which predicts the deviations from Blanc's Law in situations where only elastic scattering occurs. The measured deviations in mixtures of He-Ne and Ne-Ar are in good qualitative agreement with the predictions of this theory. In H2-N2 mixtures the measured deviations are of opposite sign and differ in magnitude from the predictions of the recent theory of Mason and Hahn (1972). The measured values of the reduced mobility of the ions in the pure gases are estimated to be in error by less than +or-2% over the whole range of E/N and the errors in the measured deviations from Blanc's Law are considered to be less than +or-0.4%.
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