Pressure dependence of the Knight shift in monovalent metals

A first-principles calculation of the volume dependence of the Knight shift in monovalent metals is made. For each case, the susceptibility and the nuclear contact terms are obtained from a common source, namely the solution of a single Schrödinger equation for a screened ion potential. Semi-quantitative agreement with experiment is obtained. For the heavier alkalis, the increasing importance under pressure of the d character of the valence electrons emerges and provides a link with an explanation previously offered of the pressure dependence of the resistivities.