Abstract: The novel potentialities of Disappearance Potential Spectroscopy for fundamental studies and practical application are highlighted. Electronic structure of the adsorbed species can be characterized properly from an extended spectra processing due to following reasons. First, because of the pronounced sensitivity of this technique to precious few top sample layers exactly those are responsible for the processes of adsorption and surface reactions. Second, due to availability of the novel kind of electron-solid interaction, namely the conjugate electron excitation developed recently from the model studies. The latter phenomenon consists in ordinary substrate core level excitation accompanied by electron transition from the valence state of adsorbed particle to vacuum level. This is displayed experimentally as a set of spectral satellites localized by the respective ionization potential above the Fermi level of a given substrate component. It enables to fingerprint the electronic valence state structure and thus to ascertain the chemical nature of adsorbed species of any complexity. It also gives potentiality to determine an exact location of adsorbed particle on the composite substrate surface. Disappearance potential spectra duly reveal another substrate electronic peculiarity such as surface and bulk plasmon excitations in addition to regular data on density of the vacant state structure. Besides, the comparison of experimental data and results of adequate quantumchemical calculations can reveal the location of adsorbed atoms with respect to the top substrate layer, and provides reliable information on the bond nature of adsorbed species. Presented results on the whole denote the considerable unity of substrate and adsorbate electronic structures as an essential quality of adsorbed system.

Cite: Cholach A.R.
Advanced Power of Disappearance Potential Spectroscopy in the Adsorbed Species Identification
In compilation Book Series: Chemistry Research Summaries. – Nova Science Pub Inc., 2014. – Т.5. – C.207-208. – ISBN 9781633212435.

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