We study the structural dynamics of liquid water by time-resolved anisotropic x-ray scattering under the optical Kerr effect condition. In this way, we can separate the anisotropic scattering decay of 160 fs from the delayed temperature increase of similar to 0.1 K occurring at 1 ps and quantify transient changes in the O-O pair distribution function. Polarizable molecular dynamics simulations reproduce well the experiment, indicating transient alignment of molecules along the electric field, which shortens the nearest-neighbor distances. In addition, analysis of the simulated water local structure provides evidence that two hypothesized fluctuating water configurations exhibit different polarizability.
Autori: | ||
Data di pubblicazione: | 2020 | |
Titolo: | Anisotropic X-Ray Scattering of Transiently Oriented Water | |
Rivista: | PHYSICAL REVIEW LETTERS | |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1103/PhysRevLett.125.076002 | |
Volume: | 125 | |
Appare nelle tipologie: | 2.1 Articolo su rivista |