Köppen, M., Du, J., Löchel, H., Oberkofler, M., Paffenholz, V., Richly, M., et al. (2009). Investigation of Reaction Mechanisms in Quaternary Surfaces with Energy-resolved Photoelectron Spectroscopy. Talk presented at 1st Joint BER II and BESSY II Users’ Meeting. Berlin. 2009-11-12 - 2009-11-13.