Drift Velocities of Electrons in Argon, Nitrogen, and Argon-Nitrogen Mixtures

The drift velocities of electrons produced by polonium $\alpha$-particles in a parallel-plate ionization chamber have been measured for pure argon, pure nitrogen, and argon-nitrogen mixtures. The argon data agree with the results of other investigators using the same method, but disagree with those obtained from the pulsed x-ray method. The nitrogen data agree with the results published by early investigators.