Relationship of intensities of absorption bands of adsorbed molecules to the energy of adsorption and the number of adsorption sites

Autor: Gorchev, V. F., Goncharuk, V. V., Taranukhina, L. D., Grebenyuk, A. G.
Zdroj: Theoretical and Experimental Chemistry; July 1985, Vol. 21 Issue: 4 p453-457, 5p
Abstrakt: A derivation of an equation which makes it possible to relate the intensities of the absorption bands in the optical spectra of test molecules adsorbed on a surface to the number and energetics of the adsorption sites has been proposed. In the general case, the ratio between the intensities of absorption bands is determined by the energy of the interaction of the adsorbate with the surface sites, the ratio between the numbers of sites, and the oscillator strengths of the optical transitions of the adsorbed molecules. The validity of the equation has been confirmed by analyzing the transmission spectra of p-dimethylaminoazobenzene adsorbed on monosubstituted forms of Glukhov kaolinite containing singly (Na+, H+), doubly (Mg2+), and triply (A13+) charged cations in its exchangeable positions.
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