Ultrafast X-ray absorption study of longitudinal–transverse phonon coupling in electrolyte aqueous solution

Yishuo Jiao; Bernhard W. Adams; Asmus Ougaard Dohn; Klaus B. Møller; Hannes Jónsson; Christoph Rose-Petruck

doi:10.1039/C7CP02978K

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Ultrafast X-ray absorption study of longitudinal–transverse phonon coupling in electrolyte aqueous solution

Yishuo Jiao,

^a Bernhard W. Adams,†^b Asmus Ougaard Dohn,^c Klaus B. Møller,^d Hannes Jónsson

^c and Christoph Rose-Petruck*^a

Author affiliations

* Corresponding authors

^a Department of Chemistry, Brown University, 324 Brook St., Box H, Providence, RI 02912, USA
E-mail: crosepet@brown.edu

^b Argonne National Laboratory, 9700 S. Cass Ave, Argonne, IL 60439, USA

^c Faculty of Physical Sciences, VR-III, University of Iceland, 107 Reykjavík, Iceland

^d Department of Chemistry, Technical University of Denmark, Kemitorvet 207, DK-2800 Kgs. Lyngby, Denmark

Abstract

Ultrafast X-ray absorption spectroscopy is applied to study the conversion of longitudinal to transverse phonons in aqueous solution. Permanganate solutes serve as X-ray probe molecules that permit the measurement of the conversion of 13.5 GHz, longitudinal phonons to 27 GHz, transverse phonons that propagate with high-frequency sound speed. The experimental results, combined with QM/MM MD simulations, show that the hydrogen bond network around the charged solutes has a glass-like stiffness that persists for at least tens of picoseconds.

This article is part of the themed collection: 2017 PCCP HOT Articles

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Article information

DOI: https://doi.org/10.1039/C7CP02978K
Article type: Paper
Submitted: 05 May 2017
Accepted: 25 Sep 2017
First published: 25 Sep 2017

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Phys. Chem. Chem. Phys., 2017,19, 27266-27274

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Ultrafast X-ray absorption study of longitudinal–transverse phonon coupling in electrolyte aqueous solution

Y. Jiao, B. W. Adams, A. O. Dohn, K. B. Møller, H. Jónsson and C. Rose-Petruck, Phys. Chem. Chem. Phys., 2017, 19, 27266 DOI: 10.1039/C7CP02978K

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Physical Chemistry Chemical Physics

Ultrafast X-ray absorption study of longitudinal–transverse phonon coupling in electrolyte aqueous solution

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