Journal
PHYSICAL REVIEW B
Volume 75, Issue 23, Pages -Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevB.75.233417
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We report experimental and theoretical evidence of surface effects in the Ni 2p x-ray photoemission spectra (XPS) of NiO. The Ni 2p(3/2) surface-enhanced XPS of a NiO sample show a relative enhancement of the intensity of the known satellite at 1.5 eV higher binding energy from the main line, indicating a considerable surface contribution of this satellite. The results are discussed in terms of bulk-octahedral and surface-pyramidal Ni symmetries. Other contributions, like nonlocal screening effects, cannot be neglected.
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