Mesoscopic Dynamics in Molecular Liquids: Universality of Nondispersive Structural Mode and Its Reflection in Self-Atomic Motions
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.
Authors
- M. D. Ruiz-Martín (ORCID: https://orcid.org/0000-0002-1285-042X)
- S. Arrese-Igor
- Arantxa Arbe (ORCID: https://orcid.org/0000-0002-5137-4649)
- B. Farago (ORCID: https://orcid.org/0000-0002-4651-0044)
- Juan Colmenero (ORCID: https://orcid.org/0000-0002-2440-4953)
- Gøran J. Nilsen (ORCID: https://orcid.org/0000-0002-0148-0486)
- F. Álvarez (ORCID: https://orcid.org/0000-0002-7038-0315)
Institutions
- Rutherford Appleton Laboratory (GB)
- Institut Laue-Langevin (FR)
- Material Physics Center (ES)
- Instituto de Tecnología Química (ES)
- ISIS Neutron and Muon Source
- Donostia International Physics Center (ES)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2025-03-04
- DOI
- https://doi.org/10.1103/physrevlett.134.098001
- Citations
- 2
- Primary Topic
- Spectroscopy and Quantum Chemical Studies
- Type
- article
- Field-Weighted Citation Impact
- 2.49
Funders
- Eusko Jaurlaritza
- Ministerio de Ciencia e Innovación
- European Regional Development Fund
- Agencia Estatal de Investigación