Figure 3: Reduction of background scattering by MLEA window frame.
From: Imaging live cell in micro-liquid enclosure by X-ray laser diffraction
(a) Scattering pattern when nothing was placed at the focal plane. (b) Scattering pattern from saline solution (NaCl 0.9% (w/v)) in MLEA with a solution layer thickness of 500 nm. a and b are shown in a logarithmic scale. The average of 73 shots for each case is shown. The maximum photon counts per pixel for the averaged scattering patterns are 452 for a and 45 for b, and the reduction rate is 9.9%. The average photon counts per pixel are 3.5 for a and 0.5 for b, and the reduction rate is 14.4%. The result demonstrates that the frame of the MLEA window helped reduce parasitic scattering. The average incident pulse energies measured at the optics hutch downstream of the double total-reflection mirrors are 203 and 195 μJ per pulse for a and b, respectively. Note that X-ray absorption is negligible for b with a transmission of 98% for 5.5 keV X-rays.
