Image bandpass filter in photoelectron spectromicroscopy

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Abstract
The design and construction of an imaging bandpass electron energy analyzer which operates in the intermediate magnetic field of a photoelectron spectromicroscope is described. Image electrons injected parallel to the magnetic field are guided, using crossed magnetic and nonuniform electrostatic fields, to a low-pass electron mirror and subsequently a high-pass retardation filter. The nonuniform electrostatic fields compensate for the energy-dependent dispersion of the crossed fields. A bandwidth-limited photoelectron image demonstrates the spatial integrity of the image after passage through the image bandpass filter. The performance of the device as an energy analyzer is assessed. An energy resolution of less than 30 meV is demonstrated and thermionic electron spectra are presented with electron energies ranging from 10 to 200 eV with a 250-meV bandwidth. Area-selected photoelectron spectra from Au and W show UPS and XPS performance of the device. In the case of Au, the spectrum was obtained from a 400-×400-nm area.

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