Imaging band-pass analyzer using double 90° spherical analyzers

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Abstract
The design and testing of an imaging band-pass analyzer (BPA) consisting of two 90° spherical sectors operating in a magnetic-field-free region is described. Image electrons injected nearly parallel to one another and perpendicular to the first 90° sector are focused into an energy plane where electrons of desired energy are band-pass filtered. A second 90° sector is used to recover the energy-filtered image. With a 1-mm aperture, energy resolution of 1% and spatial resolution of 0.01% of the main path radius are calculated and agree well with the test results over an image size of 12×12 mm2. The addition of this analyzer to our magnetic projection photoelectron microscope poses an additional technological problem in that the electrons are required to pass from a relatively high-field area to a field-free region without disruption of the image. Design considerations for a structure that abruptly terminates a magnetic field yet is transparent to image electrons are described.

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