By Smorogdinsky M.
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Example text
The long-distance motion is a cooperative phenomenon with several particles involved. Function δr2 (t) increases with t much more slowly than expected for ballistic motion. 9 demonstrates that the slowing-down of the meansquared displacement becomes dramatic if the temperature decreases. In a LJM, this temperature decrease is to a large extent equivalent to an increase of the effective particle diameter for the collision. 466, hundreds of collisions occur, before cooperative motions destroy the transient localization.
11. 480dense-polymer-melt model defined in connection with Fig. 466-LJM defined in connection with Fig. 4 (dashed-dotted line). 0 (from left to right). The horizontal axis present the rescaled times t˜ = D · t, where D denotes the particle diffusivity at the respective temperature. The heavy dashed line exhibits a fit of the above-plateau increase by the 2 + hMSD t˜b ]. The quanvon Schweidler-law part of Eq. 123): δrs2 (t) = 6[rsc tity Re2 is the averaged end-to-end distance squared of the decamer chains.
1987) using a spin-echo spectrometer. An upgrading of this instrument was applied to obtain the data for φq (t) exhibited in Fig. 7 for the time interval marked by IN11. The shown decay curves are normalized to φq (t = 0) = 1. They are measured for the van der Waals liquid orthoterphenyl (OTP). A time-of-flight spectrometer was used to measure φq (ω) on a frequency interval larger than two decades. These data were Fourier-transformed to get the decay curves within the interval marked by IN5. 7 displays dynamics on a time interval, which corresponds closely to the frequency interval displayed in Fig.