Strong dynamic screening in weak chemisorption systems

Green's function calculations have been carried out on the N 1s XPS of a linear NiN sub 2 cluster used as a model of the N sub 2 /Ni(100) system. A good agreement with the experimental spectra is obtained. A new method, based on exact effective Hamiltonians (EEH) is used for a detailed analysis...

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Bibliographic Details
Published in:Surface science 1997-09, Vol.402-404 (1-3), p.508-512
Main Authors: Dobrodey, N V, Cederbaum, L S, Tarantelli, F
Format: Article
Language:English
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Summary:Green's function calculations have been carried out on the N 1s XPS of a linear NiN sub 2 cluster used as a model of the N sub 2 /Ni(100) system. A good agreement with the experimental spectra is obtained. A new method, based on exact effective Hamiltonians (EEH) is used for a detailed analysis of adsorbate core hole screening. Two lowest energy states in the spectrum, split by 1.47 eV are classified as pi - > pi exp * shake-down satellites, whereas two states dominating the region of the so-called "giant satellite" are attributed to the main states. The EEH technique has disclosed a dominant role of dynamical screening in the formation of the strong shake-down satellites in the spectrum.
ISSN:0039-6028