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CuO (cupric oxide)

L edge of CuO (opens larger version)
Cu L3 and L2 edges of CuO. The sharp peak (“white line”) at 931 eV reflects the excitonically-enhanced empty d states on the Cu site.

By: Peter Ercius and Jerome Hyun

Microscope: VG HB 501UX STEM

Energy Resolution: 0.73 eV