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MnO, Mn3O4, Mn2O3

Spectra for Manganese (Mn)

Mn L edge spectra  (opens larger version)
Mn L edge spectra for different Mn oxides. Mn 3+ and Mn 2+ formal valence states each show a sharp peak at the edge onset, with the 2+ peak about 2 eV below the 3+. (The effect is much less pronounced for 3+ vs 4+)

By: Yao Yang

Microscope: Nion UltraSTEM (100 keV)

Energy Resolution: 0.5 eV

Note: The energy axis of the Mn edge has been calibrated using dual EELS map. 

Ref: Yang, PNAS, 2019, 116, 24425