Microscopic collective dynamics in liquid neon-deuterium mixtures: Inelastic neutron scattering and quantum simulations
- Author(s)
- Daniele Colognesi, Ubaldo Bafile, Eleonora Guarini, Tatiana Guidi, Martin Neumann
- Abstract
In this paper a combined neutron scattering and quantum simulation study of the collective dynamics in liquid Ne-D2 mixtures, at a temperature of T = 30 K and in the wave-vector transfer range 4 nm???1 < q < 51 nm???1, is presented. Two D2 concentrations are investigated, one close to 25% molar and the other close to 50% molar, together with pure Ne. The dynamic structure factor for the centers of mass of the two molecular species is extracted from the neutron scattering data and subsequently compared with that obtained from three different quantum simulation methods, such as ring polymer molecular dynamics and two slightly different versions of the Feynman-Kleinert approach. A general agreement is found, even though some discrepancies both among simulations, and between simulations and experimental data, can be observed. In order to clarify the physical meaning of the present spectroscopic results, an analysis of the longitudinal current spectral maxima is carried out showing the peculiarities of the D2 center-of-mass dynamics in these mixtures. A comparison with the centroid molecular dynamics results obtained for the D2 center-of-mass self-dynamics in the same liquid mixtures is finally proposed.
- Organisation(s)
- Computational and Soft Matter Physics
- External organisation(s)
- Institute of Genetics and Biophysics "Adriano Buzzati-Traverso", CNR, University of Florence, Rutherford Appleton Laboratory
- Journal
- Physical Review E
- Volume
- 105
- No. of pages
- 18
- ISSN
- 2470-0045
- DOI
- https://doi.org/10.1103/PhysRevE.105.054603
- Publication date
- 05-2022
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103015 Condensed matter, 103043 Computational physics, 103029 Statistical physics
- Keywords
- ASJC Scopus subject areas
- Condensed Matter Physics, Statistical and Nonlinear Physics, Statistics and Probability
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/c24ea699-9228-4c43-a303-be8749e5b0c4