Calculated against experimental charge density distribution of Be metal

The authors have performed self-consistent linearised augmented plane wave calculations for the charge density of metallic beryllium, with and without warping of the interstitial potential, using the local density approximation for the exchange and correlation energy functional. Overall agreement with the newest X-ray form factors is good, and it is argued that the remaining discrepancies have their source in the adequacy of the local density approximation and, for some reflections, in neglecting the non-sphericity of the core charge density.