Abstract
A novel instrument for imaging ESCA is described. It is based on a tandem arrangement of twohemispherical energy analysers used as an imaging energy filter. The main spherical aberration(α2-term) of the analyser is corrected by the antisymmetry of the tandem configuration. Thekinetic energy range useable for imaging extends up to 1.6 keV; this is compatible with Mg andAl Kα laboratory x-ray sources. First experiments on the chemical surface composition of aCu0.98Bi0.02 polycrystal, a GaAs/AlGaAs heterostructure and Ag crystallites on Si(111) have beenperformed using synchrotron radiation. The results reveal an energy resolution of190 meV and a lateral resolution (edge resolution) of 120 nm. Besides eliminationof the analyser’s spherical aberration, the tandem arrangement largely retainsthe time structure of the electron signal, unlike a single hemispherical analyser.
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