Structural relaxation in pure liquids: Analysis of wavenumber dependence within the approach of generalized collective modes

• Дата: 2008
• Автори: Bryk, T., Mryglod, I.
• Формат: Стаття
• Мова: English
• Опубліковано: Інститут фізики конденсованих систем НАН України 2008
• Назва видання: Condensed Matter Physics
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/119003
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Structural relaxation in pure liquids: Analysis of wavenumber dependence within the approach of generalized collective modes / T. Bryk, I. Mryglod // Condensed Matter Physics. — 2008. — Т. 11, № 1(53). — С. 139-154. — Бібліогр.: 26 назв. — англ.

Wavenumber dependence of structural relaxation in liquids is studied by the method of generalized collective modes (GCM). A new perturbation approach within the GCM method is proposed and applied in the longwavelenth limit in order to obtain analytical expressions for the wavenumber-dependent structural relaxation and sound dispersion within a simplified three-variable dynamical model. Analytical results are compared with numerical study of generalized modes within a more general five-variable dynamical model, which accounts for thermal processes in liquids. Numerical results are presented for four thermodynamic points of Lennard- Jones fluid at the reduced temperature T* = 1.71. We discuss the features of non-hydrodynamic process of structural relaxation in different regions of wavenumbers.