Fig. 1

Single-molecule scattering and photon correlations. a A stream of randomly oriented particles is injected into the XFEL beam, hit sequentially by femtosecond X-ray pulses, and the coherently scattered photons (red dots) are recorded on the pixel detector. b In the detector plane k _x k _y the recorded photons are grouped into triplets, each of which is characterized by distances k₁, k₂, k₃ to the detector center (orange lines) and the angles α and β between the respective photons (orange circular arcs)