Determination of wj and effective collision frequency in a weakly ionised magneto plasma

The parameter for electrons in a PIG type magneto plasma has been determined experimentally. From the measured values of ωtau, the effective collision frequency νe for electrons has been evaluated for two pressures (1.1 x 10-2 and 2.8 x 10-2 Torr) in argon gas. The values of ωtau and νe, although agree in order of magnitude with the values calculated for electron-neutral collisions, show an unusual dependence on the applied magnetic field. It is probable that the observed dependence arises due to the restriction of electron motion perpendicular to the magnetic field. (author)