The effect of the amplitude of fluctuations on the coefficient of frictionof the Brownian oscillator in aqueous medium

The methods of molecular dynamics and correlation functions of coordinates were applied to investigate molecular oscillations in water solution at a v ariation of the amplitude of fluctuations, It was established, that the amp litude of fluctuation exceeds the threshold value (in water of the order of 0.3 - 0.45 Angstrom), of the force of friction sharply increases, and the vibration mode changes to the mode of limited diffusion. The consistency of the results with the theory of Mossbauer effect and the model of Brownian oscillator for conformational mobility in biopolymers is discussed.