Some magnetic properties of metals II. The influence of collisions on the magnetic behaviour of large systems

A discussion of the effect of collisions on the magnetic properties of a large system of free electrons shows that the non-periodic term in the susceptibility is hardly affected, but that the periodic terms are reduced in magnitude by a factor exp (-hp/$\tau \beta $H), where p is the harmonic considered, $\tau $ is the mean collision time, and $\beta $ = eh/2$\pi $mc.