Zelenin S. Optical and relaxational properties of disordered media with nanostructure

The thesis is devoited to presentation of a theory which al-lowsto describe pecularities of low-frequency Raman spectra (“boson” and “central” peaks) of glass-like materials. The basic idea of a theory is that the structure of a glass contains clusters of nanometer sizes/ For the first time the essential influence of the Laplace pressure on the elastic characteristics of clusters is demonstrated. To analyze the pecularities of the quasielastic scattering we propose the theory in which the presence inside or on the surface of clusters the mobile defects is considered. The theory of non-Debye kinetics and spectra of the photolu-minescence of porous silicon at finite temperature is presented. The results of the calculations have a good agreement with the experiments