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Normalized L XAS for Ni inside a dilute Ct-CODH enzyme (<0.077% Ni) measured by partial fluorescence yield with an STJ detector (red) and inside a concentrated [NiII(RS)4] complex measured by total electron yield with a channeltron (green). The top inset shows the energy resolution in the region of 300–1500 eV for an advanced STJ detector. The middle inset is a photo of a STJ head snout.
