Developing an in-situ LED Irradiation System for Small-Angle X-Ray Scattering at B21, Diamond Light Source

Abstract

Abstract Beamline B21 at the Diamond Light Source synchrotron in the UK is a SAXS beamline that specialises in high-throughput measurements via automated sample delivery systems. A system has been developed whereby a sample can be illuminated by a focussed beam of light coincident with the X-ray beam. The system is compatible with the highly automated sample delivery system at the beamline and allows a beamline user to select a light source from a broad range of wavelengths across the UV and visible spectrum and to control the timing and duration of the light pulse with respect to the X-ray exposure of the SAXS measurement. The intensity of the light source has been characterised across the wavelength range enabling experiments where a quantitative measure of dose is important. Finally, the utility of the system is demonstrated via measurement of several light-responsive samples.