Core-level shake-up spectra from ordered C, N and O overlayers on Ni(100)

The XPS core-level shake-up spectra reveal significant differences between C, N and O adsorbed on Ni (100). It is shown that the satellites are due to local excitations on the adsorbate and not to excitations within the substrate. This makes shake-up spectroscopy an important tool for investigating...

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Bibliographic Details
Published in:Chemical physics letters 1991-07, Vol.182 (2), p.147-151
Main Authors: Nilsson, Anders, M»rtensson, Nils
Format: Article
Language:English
Subjects:
Atomic and molecular physics
Atomic properties and interactions with photons
Exact sciences and technology
Photon interactions with atoms
Physics
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Summary:The XPS core-level shake-up spectra reveal significant differences between C, N and O adsorbed on Ni (100). It is shown that the satellites are due to local excitations on the adsorbate and not to excitations within the substrate. This makes shake-up spectroscopy an important tool for investigating the adsorbate electronic structure. The screening of the O1s core hole leads to a complete filling of the 2p shell whereas the main satellite has a 2p 5 configuration. The observation of an atomic-like 1s—2p exchange splitting of the satellite indicates a strong localization tendency for the 2p shell. The observed differences between the satellite spectra for the p(2×2) and c(2×2) phases of adsorbed oxygen can be related to different 2p—2p overlap strengths.
ISSN:0009-2614
1873-4448
DOI:10.1016/0009-2614(91)80119-I