Conduction Bands in Cesium Fluoride

The mixed-basis method has been used to calculate the conduction-band structure of CsF. Relativistic effects have been included. The resulting bands are found to resemble strongly those of most other alkali halides; in particular, there is no indication that the point $X_3$ is nearly degenerate with ${\Gamma }_1$, as conjectured earlier by one of us (WBF).