URL: https://physikseminar.desy.de/zeuthen/past_colloquia/colloquia_in_2014/april_16_2014/@@siteview
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Time-resolved experiments with atoms and molecules at FLASH
Robert Moshammer (Max-Planck-Institut für Kernphysik)
Seminar room 3, 3.00 pm
The free-electron laser FLASH at Hamburg (DESY) provides ultra-short (~10 femtoseconds) and extremely intense (~1012 photons/pulse) light pulses over a wavelength regime (XUV) that is particularly interesting for basic research in atomic and molecular physics as well as photochemistry. In combination with many-particle imaging spectrometers (so-called reaction microscopes for the coincident detection of ions and electrons) FLASH enables detailed studies at light intensities of 1014 W/cm2 or more that reveal insight into the coupling of light with matter. How does an atom absorb two or more photons from an intense XUV pulse, and how is the energy released after the interaction? This and other fundamental processes are subject of ongoing research. Pump-probe experiments with molecules allow the observation of rotational, vibrational and electronic excitations with unprecedented resolution and in real time, and time-resolved experiments with molecules are very first steps towards the visualization of fundamental molecular reactions. The general physical and technical concepts will be discussed and recent results will be presented.
