Abstract
This work reports experimental evidence for a redshift in the main peak in the valence electron energy loss spectrum of nanoporous MgO. An interpretation is given based on effective-medium response theory. We find that the main peak energy depends on the density of nanopores within the illuminated area. As a result, by combining electron energy loss spectroscopy with transmission electron microscopy imaging, the loss peak position may be used to measure the porosity of nanoporous materials.
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