We measured the work function of micrograins at the surface of a polycrystalline copper sample using NanoESCA, a photoelectron microscope equipped with two analysers in series. This allowed us to obtain accurate spectroscopic information with energy‐filtered images showing lateral resolutions of 40 nm. Reconstructed microspectra directly show variations in the local work function of grains having different crystalline orientation.
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Renault et al. (2006) studied this question.
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