VAN DER WAALS INTERACTION

BETWEEN A molecule AND a metallic bubble :

anisotropy and nonlocality effects

A. Semlali1,*, B. Labani2, M. Rachid1

1 L.P.M.C , Département de Physique, Faculté des Sciences,

Université Chouaib Doukkali, B.P 20,24000 El Jadida, Morocco.

2 Département de Physique, Faculté des Sciences Semlalia,

Université Cadi Ayyad, Bd Prince My Abdellah B.P S15, Marrakech, Morocco.

* Corresponding author. E-mail: semlali@ucd.ac.ma

Received : 02 May 2001 ; revised version accepted 07 June 2001

Abstract

The van der Waals energy of molecules interacting with metallic bubbles is determined from spherical-tensor theory by using the response field susceptibility of the spherical bubble. The dependence of this energy on the first Euler angle is a manifestation of the anisotropy of the interaction. In order to illustrate the non locality and anisotropy effects as well as the importance of the spherical bubble curvature on the potential magnitudes, we present numerical results for typical systems (HF, HCl molecules ) on (Ag, Al) surfaces. It is shown that the metallic plate of thickness e=b-a appears as a special case of the spherical bubble of radii a,b.

Keywords : Molecule-solid interactions; Physical adsorption; Admolecules; Metallic surfaces.

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