Interaction of Acoustic and Quasi-Elastic Modes in Liquid Water on Nanometer Length Scales

Autor:	Ishikawa, Daisuke, Baron, Alfred Q. R.
Rok vydání:	2021
Předmět:	Condensed Matter - Soft Condensed Matter Condensed Matter - Mesoscale and Nanoscale Physics
Zdroj:	Journal of the Physical Society of Japan, Vol.90 (2021) No.8, Article ID: 083602
Druh dokumentu:	Working Paper
DOI:	10.7566/JPSJ.90.083602
Popis:	We investigate the presence of an acoustic-quasi-elastic interaction contribution in the IXS spectra of liquid water at 301K using inelastic x-ray scattering with sub-meV energy resolution at momentum transfers 0.77<=Q<=4.20 /nm. The contribution appears due to the overlap the acoustic mode with the tail the quasi-elastic mode and is fully consistent with hydrodynamic theory. Incorporating this interaction allows us to describe the dynamic structure factor, S(Q,w), without introducing an extra mode, and may help explain earlier contradictory interpretations. The sound velocity, and relative intensity of the quasi-elastic and acoustic mode, plateau for Q>2/nm at values consistent with a viscoelastic generalization of the Landau-Placzek relation. Comment: arXiv version includes supplemental material
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2107.09827 Zobrazit plný text záznamu View this record from Arxiv