BOSON PEAK IN LOW-FREQUENCY RAMAN SPECTRA OF POLYMETHYLMETHACRYLATE
M. A. Korshunov1, V. F. Shabanov1,2
1Kirenskii Institute of Physics SB RAS, Akademgorodok 50/38, Krasnoyarsk 660036
2Krasnoyarsk Scientific Center, Akademgorodok 50, Krasnoyarsk 660036
Keywords: бозонный пик, спектры комбинационного рассеяния света, ангармонизм, моделирование, boson peak, Raman spectra, anharmonicity, modeling
Abstract
The role of the local field, anharmonicity, and degree of disorder in the formation of the boson peak has been studied. The Raman spectrum of low frequencies of a model crystal of polymethylmethacrylate with disorder elements was calculated using the method of atom-atom potentials taking into account the effect of local fields on the spectrum. The calculations were carried out for a crystal containing rigid molecules of an oligomer of isotactic polymethylmethacrylate and for a structure with flexible molecules.
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