NMR investigation of the electronic structure of expanded liquid cesium.

We describe a comprehensive study of the sup (133) Cs Knight shift and nuclear relaxation rates in liquid cesium from the vicinity of the melting point to the critical region of the liquid-gas transition. The data covers a temperature range 55 - 1590C at pressures up to 90 bars and includes a wide range of sample densities from 0.70 to 1.93 g/cm sup 3. Measurements extended to pressures of 900 bar in the lower part of the temperature range. The data yield the isobaric temperature dependence, the isothermal pressure dependence, and the isobaric temperature dependence of the Knight shift as well as the isobaric temperature dependence of the nuclear relaxation rate. At low densities, a strong enhancement of the Knight shift was observed which is related to enhancement of the static susceptibility.