The interplay of van der Waals and weak chemical forces in the adsorption of salicylic acid on NaCl(001)

verfasst von

Wei Chen, Christoph Tegenkamp, Herbert Pfnür, Thomas Bredow

Abstract

The role of long range dispersion forces plays a significant role in the adsorption of weakly chemisorbed molecules, as demonstrated by our first-principles calculations with the van der Waals density functional (vdW-DF) applied to the model system salicylic acid (SA) on the NaCl(001) surface. While the vdW interaction accounts for more than half of the adsorption energy, the equilibrium geometry is still mostly determined by the chemical interaction between O and Na atoms. This seems to be due to a compensation effect of the vdW interaction in different parts of the planar SA molecule. The inclusion of the vdW interaction also results in a closer alignment of the highest occupied orbital of SA and the valence band maximum of NaCl(001) as a consequence of stronger hybridizations.

Organisationseinheit(en)

Institut für Festkörperphysik

Externe Organisation(en)

Rheinische Friedrich-Wilhelms-Universität Bonn

Typ

Artikel

Journal

Physical Chemistry Chemical Physics

Band

11

Seiten

9337-9340

Anzahl der Seiten

4

ISSN

1463-9076

Publikationsdatum

22.10.2009

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Allgemeine Physik und Astronomie, Physikalische und Theoretische Chemie

Elektronische Version(en)

https://doi.org/10.1039/b911944b (Zugang: Unbekannt)