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Calculations of frequencies of the lattice and surface oscillations oforganic nano-crystals are carried out. As the sample the para-dichlorobenzolhas been chosen. Change of spectra of oscillations from the sizes ofnano-particles is found. It is shown that with the reduction of the sizes ofnano-particles a spectrum of the surface oscillations prevailing. Calculationshave shown that for the correct interpretation of the observational spectra itis necessary to consider orientation disorder of the surface molecules andpresence of vacancies in nano-particle volume.

Calculation of Spectra of the Lattice and Surface Vibrations of Organic Nano-Crystals