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Mesoscopic Dynamics in Molecular Liquids: Universality of Nondispersive Structural Mode and Its Reflection in Self-Atomic Motions

Year: 2025
Type: article
Abstract: Neutron spin echo experiments on deuterated and protonated molecular liquids with different interactions have revealed their coherent and incoherent scattering functions at the mesoscale. The coherent one decays by a nondiffusive exponential relaxation process that can be related to stress fluctuations. For self-dynamics, we show that even though diffusion is, as expected, the predominant relaxation channel at the mesoscale, the process observed for collective dynamics also appears at short times, evidencing the influence of stress fluctuations on translational motions even at high temperatures.
DOI: 10.1103/physrevlett.134.098001
Authors: Arantxa Arbe, Silvia Arrese-Igor, María Dolores Ruiz-Martín, Bela Farago, Fernando Alvarez, Gøran J. Nilsen, Juan Colmenero
Institutions: Material Physics Center, Institut Laue-Langevin, University of the Basque Country, Rutherford Appleton Laboratory, ISIS Neutron and Muon Source, Donostia International Physics Center
Language: English
Open Access status: green
Awards: G1725396045, G2262748287, G2387266859, G3480869486, G3669987061, G425668148, G451172965, G451917667, G5967599077, G7807080504
OpenAlex ID: W4408149789
FWCI: 2.274
Cites: 27
Cited by: 11
Related to: 10