Improved values of the forward X-ray scattering factor for metallic aluminium

The real and imaginary parts of the forward X-ray scattering factor of metallic aluminium are reported for photon energies from 10 to 104 eV. The imaginary part of the scattering factor f2(ω) was derived from the absorption database of Shiles, Sasaki, Inokuti and Smith with the addition of solid-state structure near the K edge. The real part of the scattering factor f1(ω) was determined by a self-consistent dispersion (Kramers-Kronig) analysis. This analysis predicts a substantially smaller value for f1 at the K-edge minimum than do previous studies. It also predicts that the strong anomalous dispersion associated with the LII,III edge drives f1(ω) negative between 68 and 93 eV. (orig.)