| Autor: |
Morhenn H; Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II) and Lehrstuhl für Funktionelle Materialien, Physik-Department, Technische Universität München, 85747 Garching, Germany and Friedrich-Alexander-Universität Erlangen-Nürnberg, Lehrstuhl für Kristallographie und Strukturphysik, Staudtstrasse 3, 91058 Erlangen, Germany., Busch S, Meyer H, Richter D, Petry W, Unruh T |
| Jazyk: |
angličtina |
| Zdroj: |
Physical review letters [Phys Rev Lett] 2013 Oct 25; Vol. 111 (17), pp. 173003. Date of Electronic Publication: 2013 Oct 22. |
| DOI: |
10.1103/PhysRevLett.111.173003 |
| Abstrakt: |
Neutron scattering and extensive molecular dynamics simulations of an all atom C(100)H(202) system were performed to address the short-time dynamics leading to center-of-mass self-diffusion. The simulated dynamics are in excellent agreement with resolution resolved time-of-flight quasielastic neutron scattering. The anomalous subdiffusive center-of-mass motion could be modeled by explicitly accounting for viscoelastic hydrodynamic interactions. A model-free analysis of the local reorientations of the molecular backbone revealed three relaxation processes: While two relaxations characterize local bond rotation and global molecular reorientation, the third component on intermediate times could be attributed to transient flowlike motions of atoms on different molecules. The existence of these collective motions, which are clearly visualized in this Letter, strongly contribute to the chain relaxations in molecular liquids. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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