Abstract
The spatial resolution of the vector potential photoelectron microscope is determined by the maximum size of the cyclotron orbits of the imaged electrons at the surface of a sample. It is straightforward to calculate the spatial resolution for any imaged electron energy given the magnetic field strength. However, in low-energy secondary photoelectron images from an aluminium-calcium metal matrix alloy, we find the apparent spatial resolution is significantly higher than expected. A possible explanation for the enhanced resolution is that the low-energy cyclotron orbits are distorted when passing from one area of work function to another and the image is dependent on the surface field distribution.
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