Abstract
Curves of reduced mobility versus reduced electric field of gaseous ions in gases of different species, for example alkali ions in rare gases, usually have a hump on the right-hand side of the flat part in the low reduced field ( E / N ) region. Such curves have been explained to be caused by the potential well formed by an induced dipole attraction potential and a steep repulsion potential. On the other hand, mobility curves with humps have been obtained with a model cross section which rapidly increase with the decrease in relative velocity through analysis utilizing the flight time integral (FTI) method. This model can also explain the temperature dependence of mobility curves.
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