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Because Cu0 and Cu1+ have almost the same bindingenergy, these two charge states of Cu cannot be identified based on
the chemical shift in binding energy alone. However, Cu is an unreactive
metal and cannot be oxidized into Cu2O in the nitrogen
atmosphere. Possibly a small amount of Cu2O is formed by exposing
to the air. Besides, Cu1+ s a chemically unstable state, and it can
be further oxidized to Cu2+ on the surface.
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