MODELING OF THE OPTICAL-PROPERTIES OF MULTICOMPONENT FILMS ON SMALL ISOTROPIC SPHERES

The model developed recently by us for calculating the optical propert ies of a small isotropic sphere, with a radially uniaxial coating of m olecules, is extended here to include multicomponent coatings in an ap proximation in which the molecules, treated as point polarizable, are assumed to be randomly distributed over spherical shells of close to t he same radius. Calculations are performed to determine the effect of coadsorption of Xe on the infrared absorption properties of CO2 physis orbed on silica particles with the molecular axes oriented radially. T he calculations confirm an earlier suggestion by one of us that the ef fect of coadsorption of an ''inert molecule,'' such as Xe, on the infr ared absorption spectrum of an adsorbed species can be used to provide information on the orientation of the species with respect to the loc al surface normal.