Negative Ion Formation in Adsorbed Molecules: The Role of Surface States
- 6 March 1995
- journal article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 74 (10), 1835-1838
- https://doi.org/10.1103/physrevlett.74.1835
Abstract
The formation of negative ions in adsorbed molecules by electron impact is investigated using a layer Korringa-Kohn-Rostoker calculation in which the unoccupied electronic structure of the substrate is fully incorporated. The results reveal a striking enhancement of the cross section for resonance formation caused by the coupling of the molecular resonance to the resonance image states of the substrate. In the case of physisorbed on Ag(111), this effect greatly increases efficiency of vibrational excitation by electrons that arrive from or detach via the image states of the metal.
Keywords
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