Abstract
The distribution function of carriers in a high electric and a simultaneous magnetic field is derived taking into consideration the effect of both acoustic and optical phonon scattering. Using this distribution function, expressions for the Hall mobility are obtained. These expressions indicate, and the numerical results calculated with the parameter values of n-type germanium also verify, that if optical phonon scattering occurs in addition to acoustic phonon scattering the value of the Hall mobility is increased. The Hall mobility is also found to increase with magnetic field.