The detection limits for most elements are in the ppm range. Initial measurements were made using a W filament with an energy resolution of 1.9eV. Resolution of 1.5eV has been obtained via a LaB6 filament.
Several features are common to the spectra.
Peak A is common to both but there are subtle differences in the position and intensity of B, B' peaks, probably relating to crystal structure. 1 Fig. 1. Schematic representation of an EELS spectrum showing the principal features. 2 Fig. 2. Examples of observed and calculated EELS spectra for sulphide and sulphate minerals.