Convergence of the Bloch-waves method
  We discuss in detail the Bloch waves method for calculation of energy and orientation dependent scattering cross-section for inelastic scattering of electrons on crystals. Convergence properties are investigated and a new algorithm with superior timing and accuracy is described. The new method is applied to calculations of intensity of weakly excited spots, maps of magnetic signal, and tilt series from zone axis orientation towards three-beam orientation. 
Jan Rusz, Shunsuke Muto, Kazuyoshi Tatsumi
cond-mat.mtrl-sci