Unoccupied band narrowing in Na and its effect on the X-ray absorption K edge.
01 January 1988
The first Na K-edge absorption measurements are reported. The data reveal a narrowing of the unfilled densities of states analogous to that observed in a recent photoemission study of the conduction band and in very good agreement with new bandstructure calculations. The narrowing is found to be essential for obtaining compatibility between the K-edge threshold exponent, the L sub (2,3) edge exponent, and the singularity index in core level photoemission.