Вплив адсорбованих на поверхні частинок молекул на її поляризовність
Abstract
INFLUENCE OF THE ADSORBED ON THE PARTICLE SURFACE MOLECULES ON THEIR POLARIZABILITY MOLECULES
O. Grischuk, S. Stetsenko
Annotation. The interaction of electromagnetic radiation with metallic nanoparticles and disperse systems based on them. Research results of influence of the adsorptive layer of a metal spherical particle on its polarizability and strengthening of Raman scattering in external electric field are presented.
Key words: small particles, adsorptive layer, polarizability, Raman scattering, coefficient of strengthening
Relevance of the research and spectral characteristics of dielectric with metallic inclusions heterosystems size order of 5-15 nm due to a number of properties of these systems and their active use of modern technologies for problems dielectric and optical spectroscopy surface of the optical information recording.
Properties of objects that normally are considered homogeneous, and their response to the action of an external electromagnetic field described permittivity.
In this paper, the problem of interaction of electromagnetic radiation with small metal particles is reduced to calculation of polarizability, depending on the oscillation frequency of the electromagnetic field. Polarization values make it possible to determine the frequency of surface excitations of the metallic beads as the adsorption layer and without it.
The results allow to evaluate the effect of adsorbed layer of metal particles are spherical to enhance Raman scattering molecules adsorbed on the external electric field. The factor of more than 106, and is highly dependent on particle size. Of course, a strong dependence on particle size is associated with a deviation from the spherical shape of the particles.
Conclusions
The calculations showed that the presence of an external electric field leads to changes in electromagnetic and optical properties: the redistribution of charges offset position of peaks, reducing the intensity of absorption and increase the intensity of Raman scattering. This suggests that the adsorption of atoms or molecules on the surface of metal particles is change of luminescence, absorption, and a number of non-linear effects. The nature of the change depends on the parameters of disperse systems, excitation frequency electromagnetic radiation and the degree of roughness of the surface layer of particles.
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