抄録
Electron drift velocities obtained by simulation of Schlumbohm's and Frommhold's experiments using a Monte Carlo method are compared with theoretical electron drift velocities such as the diffusion modified drift velocity Vd, the average drift velocity of electrons Wv, the center of mass drift velocity Wr and the mean arrival time drift velocity Wm, when electron impact ionisation is present. The calculation is carried out using a constant collision frequency model gas for reducing the computational time. It is found that the electron drift velocities calculated by simulating Schlumbohm's and Frommhold's experiments do not agree with any of the theoretical electron drift velocities described above, but coincide with a drift velocity represented as (Wr+Wm)/2.
