On the Quantum Theory of the Capture of Electrons

In Section 1 the method of a previous ${\mathrm{paper}}^1$ is applied to find the rate at which $\alpha$ particles capture electrons from atoms. The mean free path for capture varies roughly with the sixth power of the velocity of the $\alpha$ particle, and in good agreement with Rutherford's ${\mathrm{experiments}.\mathrm{}}^3$ The value of the mean free path is computed for capture in air, and agrees with the experimental value.