2018/09/07 by Henriette Wase Hansen, Hansen, Henriette Wase, B. Frick +7
Earth and Planetary Sciences · Materials Science · #Earthquake Detection and Analysis #FOS: Physical sciences #High-pressure geophysics and materials #Soft Condensed Matter (cond-mat.soft) #Solid-state spectroscopy and crystallography
paper · pdf · doi:10.48550/arxiv.1809.02418
openalex publication_date 2018/09/07 · openalex created_date 2024/04/10 · openalex updated_date 2026/07/28
The relaxation dynamics in two van der Waals bonded and one hydrogen-bonding molecular liquids is studied as a function of pressure and temperature by incoherent neutron scattering using simultaneous dielectric spectroscopy. The dynamics is studied in a range of alpha relaxation times from nano- to milliseconds, primarily in the equilibrium liquid state. In this range we find that isochronal superposition and density scaling work not only for the two van der Waals liquids, but also for the hydrogen-bonding liquid, though the density scaling exponent is much smaller for the latter. Density scaling and isochronal superposition are seen to break down for intra-molecular dynamics when it is separated in time from the α-relaxation in close agreement with previous observations from molecular dynamics simulations.