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A time-of-flight technique is used for the measurement of positive ions mobilities in helium, neon and argon in the 1 - 25 atm pressure range at 25 °C. The reduced mobilities b 0  vary with the reduced electric field E/p 0  and exhibit different saturation values, which are interpreted in terms of the Langevin theory and connected with the formation of cluster ions:

Beweglichkeit und Bildung von Cluster-Ionen im eigenen Gas in He, Ne und Ar unter hohen Drucken