Analysis on energy absorption edge and electron populations of Al

A theoretical explanation for L core-shell absorption edge of electron ener gy loss spectrum of Al, an analysis of the electronic populations and a com parison between different partial cross sections are given. The edge was fi rst normalized to the same atomic ionization cross section (per atom per el ectronvolt). The contributions for the cross section come from three respec ts: the first one is the electronic transitions from the core-shell to vale nce-shell calculated by extended Huckel band model, the second one is the f inal ionization state obtained by electron gas model? the third comes from the elastic backscatting of outgoing waves by the atoms that neighbor the e xcited atom. The agreement between the calculation result and the experimen tal result is good.