Nanofocused x-ray photon correlation spectroscopy

Sharon Berkowicz, Sudipta Das, Mario Reiser, Mariia Filianina, Maddalena Bin, Giulio Crevatin, Franz Hennies, Clemens Weninger, Alexander Björling, Paul Bell, Fivos Perakis

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskriftPeer review


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=2.5μm, 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.

TidskriftPhysical Review Research
StatusPublished - 2022 juli

Ämnesklassifikation (UKÄ)

  • Atom- och molekylfysik och optik


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