The study of Al-L23 ELNES with resolution-enhancement software and first-principles calculation

Resolution-enhancement software and first principles calculation for electron energy-loss spectroscopy (EELS) were applied for the study of aluminium (Al) coordination in alumina. Al-L-23 energy-loss near-edge structures (ELNES) of alpha- and gamma-aluminas were observed using a field-emission transmission electron microscope and advanced software for EELS. The inherent energy resolution of a cold field-emission gun (FEG) of similar to0.3 eV was realized using drift-correction software. The energy spread of the cold FEG was deconvoluted by means of maximum-entropy or Richardson-Lucy algorithms and the energy resolution of the deconvoluted spectrum became comparable with that obtained using a monochromator, whose energy resolution was <0.2 eV Fine structures in Al L-23-edge were observed, such as 0.5 eV splitting between L-3 and L-2 peaks in alpha-alumina (i.e. spin-orbit splitting). The difference in Al coordination was clearly observed in Al-L-23 ELNES and the major structures near the threshold were assigned using first-principles calculations.