Time-resolved optical pump X-ray absorption probe spectroscopy in the range up to 1keV with 20 fs resolution

Time-resolved X-ray absorption spectroscopy is a powerful tool to follow the fast atomic and molecular changes on the atomic time and spatial scale. Here we demonstrate time-resolved XANES and EXAFS relying on a laser driven ultrafast XUV source. We have examined the electronic and structural changes in amorphous Si and parylene with a temporal resolution of 20 fs.