Cathodoluminescence analysis of a gold prism of side length 200 nm. (a) STEM dark field image, (b) – (d) monochromatic (spectrally resolved) cathodoluminescence images at 1.37, 1.90, and 1.95 eV (900, 650, and 420 nm, respectively) with prism outlined by yellow dotted line, (e) Overall cathodoluminescence spectrum displaying three peaks. Methods JEOL 2100F STEM mode operating 100 kV room temperature. (a) – (d) 768 x 768 pixel images acquired in 70 s
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