Time-resolved x-ray absorption fine structure (XAFS) spectroscopy with picosecond temporal resolution is a
new method to observe electronic and geometric structures of short-lived reaction intermediates. It combines an intense
femtosecond laser source synchronized to the x-ray pulses delivered into the microXAS beamline of the Swiss Light
Source (SLS). We present key experiments on charge transfer reactions as well as spin-crossover processes in
coordination chemistry compounds next to solvation dynamics studies of photogenerated atomic radicals.