Simultaneous X-ray Diffraction and Spectroscopy (image) DOE/SLAC National Accelerator Laboratory Share Print E-Mail Caption This artist's view shows a Photosystem II crystal hit by a femtosecond X-ray pulse. The resulting X-ray diffraction pattern (bottom) is used to map the overall protein structure. The X-ray emission spectrum (top) is simultaneously collected and used to probe the intactness and oxidation state of the crystal's key manganese complex (Mn4Ca). This pioneering experimental technique can be used to further study photosynthesis and other catalytic reactions and is made possible by the unique capabilities of the Linac Coherent Light Source, an X-ray free-electron laser. Credit Greg Stewart / SLAC National Accelerator Laboratory Usage Restrictions Please credit Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.