Towards ultrafast dynamics with split-pulse X-ray photon correlation spectroscopy at free electron laser sources.

Abstract:

:One of the important challenges in condensed matter science is to understand ultrafast, atomic-scale fluctuations that dictate dynamic processes in equilibrium and non-equilibrium materials. Here, we report an important step towards reaching that goal by using a state-of-the-art perfect crystal based split-and-delay system, capable of splitting individual X-ray pulses and introducing femtosecond to nanosecond time delays. We show the results of an ultrafast hard X-ray photon correlation spectroscopy experiment at LCLS where split X-ray pulses were used to measure the dynamics of gold nanoparticles suspended in hexane. We show how reliable speckle contrast values can be extracted even from very low intensity free electron laser (FEL) speckle patterns by applying maximum likelihood fitting, thus demonstrating the potential of a split-and-delay approach for dynamics measurements at FEL sources. This will enable the characterization of equilibrium and, importantly also reversible non-equilibrium processes in atomically disordered materials.

journal_name

Nat Commun

journal_title

Nature communications

authors

Roseker W,Hruszkewycz SO,Lehmkühler F,Walther M,Schulte-Schrepping H,Lee S,Osaka T,Strüder L,Hartmann R,Sikorski M,Song S,Robert A,Fuoss PH,Sutton M,Stephenson GB,Grübel G

doi

10.1038/s41467-018-04178-9

subject

Has Abstract

pub_date

2018-04-27 00:00:00

pages

1704

issue

1

issn

2041-1723

pii

10.1038/s41467-018-04178-9

journal_volume

9

pub_type

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