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NIST X-ray Photoelectron Spectroscopy Database (SRD 20), Version 5.0
Reliable, with two-point correction of energy scale
Comment:
Oxidation of Ni foil in air at 573 K for 24 h, following by heating in vacuo at 373 K for 1 h to remove surface hydration. The O1s/Ni3p atom ratio for this film is 1.4.