CHARACTERIZATION OF SURFACE DEFECTS THROUGH THE MODIFICATION OF THE INFRARED PROFILE OF ADMOLECULES: APPLICATION TO CO MOLECULES ADSORBED ON (100) MgO AND NaCl SURFACES

Author:

ZORGATI HANEN1,SAID MONCEF1,RAMSEYER CHRISTOPHE2,GIRARDET CLAUDE2

Affiliation:

1. Département de Physique, Université de Monastir, Faculté des Sciences de Monastir, UR 1319, Monastir, Tunisia

2. Laboratoire de Physique Moléculaire, UMR 6624, Université de Franche-Comté, 25030 Besançon, France

Abstract

Real surfaces display defects originating either from thermodynamic principles or from local instabilities. In order to help and characterize these surfaces and their defects, infrared spectroscopy of physisorbed test molecules can be used. As an example, we study the behavior of the infrared response of CO molecules randomly deposited on ionic surfaces of MgO and NaCl with the concentration of dipolar defects randomly distributed on these surfaces. The vibrational peak is shifted and asymmetrically broadened when the defect concentration increases as a result of surface inhomogeneity, in semi-quantitative agreement with experimental data.

Publisher

World Scientific Pub Co Pte Lt

Subject

Materials Chemistry,Surfaces, Coatings and Films,Surfaces and Interfaces,Condensed Matter Physics

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