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.
|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|
|Appare nelle tipologie:||2.1 Articolo su rivista |