Research on Surface Dynamics and Chemistry
At our storage ring BESSY-II the whole suite of surface science methodology can be applied to surfaces by making the full use of the selectivity of soft X-ray radiation. With angle-resolving RIXS we can establish the energetic and geometric structure of the surface chemical bond and the changes induced by steady state stimuli, like temperature, fields and irradiation.
We are pushing the analysis of surface systems into the study of picosecond dynamics by making use of the single bunch fill pattern of the storage ring. The lowering in average photon flux is overcome by using novel electron detection concepts. This enables standard methods like electron yield NEXAFS (near-edge X-ray absorption fine structure) and ESCA (electron spectroscopy for chemical analysis) to be applied to surfaces in time-resolved measurements on a synchrotron.
On a more fundamental level, we study basic couplings between the electronic and phononic systems in a sample and their impact on the dynamics of catalytic reactions on surfaces by making use of the intrinsic time scale of core level spectroscopies, cf. the core-hole clock method.