Nanofocused x-ray photon correlation spectroscopy

DOI: 10.1103/PhysRevResearch.4.L032012

Authors: Sharon Berkowicz (Stockholm University) , Sudipta Das (Stockholm University) , Mario Reiser (Stockholm University) , Mariia Filianina (Stockholm University) , Maddalena Bin (Stockholm University) , Giulio Crevatin (Diamond Light Source) , Franz Hennies (MAX IV laboratory) , Clemens Weninger (MAX IV laboratory) , Alexander Bjorling (MAX IV Laboratory) , Paul Bell (MAX IV laboratory) , Fivos Perakis (Stockholm University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Research , VOL 4

State: Published (Approved)
Published: July 2022

Abstract: Here, we demonstrate an experimental proof of concept for nanofocused x-ray photon correlation spectroscopy, a technique sensitive to nanoscale fluctuations present in a broad range of systems. The experiment, performed at the NanoMAX beamline at MAX IV, uses a novel event-based x-ray detector to capture nanoparticle structural dynamics with microsecond resolution. By varying the nanobeam size from σ = 88 nm to σ = 2.5 μ m , we quantify the effect of the nanofocus on the small-angle scattering lineshape and on the diffusion coefficients obtained from nano-XPCS. We observe that the use of nanobeams leads to a multifold increase in speckle contrast, which greatly improves the experimental signal-to-noise ratio, quantified from the two-time intensity correlation functions. We conclude that it is possible to account for influence of the high beam divergence on the lineshape and measured dynamics by including a convolution with the nanobeam profile in the model.

Journal Keywords: Nanoparticles; Synchrotron radiation & free-electron lasers; Coherent X-ray scattering; X-ray photon correlation spectroscopy

Subject Areas: Technique Development, Physics

Facility: NanoMAX at MAX IV

Added On: 01/08/2022 10:08

Documents:
PhysRevResearch.4.L032012.pdf

Discipline Tags:

Physics Technique Development - Physics

Technical Tags: