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Tunable far-infrared laser vibration-rotation-tunnelling spectroscopy (FIRVRTS) has been used to measure several intermolecular vibrations in the water trimer. Together with ab initio and group theoretical results, these data characterize the structure and especially the tunnelling dynamics of this system in considerable detail.

Abstract:The LCLS hard x-ray Free Electron Laser at SLAC reported first lasing in April of 2009. Since then two successful user runs have been completed at the two soft x-ray stations. The first hard x-ray station has started commissioning in July of 2010. Beam diagnostics play an essential role for tuning the machine and delivering the requested beam properties to the users. An overview of the LCLS photon diagnostics will be presented including some selected commissioning results. Plans for future improvements and upgrades will be briefly discussed.