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A: Fachverband Atomphysik
A 20: Experiments with FLASH and FEL perspectives: an overview
A 20.4: Talk
Thursday, March 13, 2008, 12:00–12:15, 3C
Xe clusters in intense laser pulses of the FLASH FEL: on vs. below 4d innershell resonance excitation — •Heiko Thomas1, Christoph Bostedt1, Matthias Hoener1, Ekaterina Eremina1, Thomas Möller1, Hubertus Wabnitz2, and Rolf Treusch2 — 1IOAP - Technische Universität Berlin — 2Hasylab at DESY
The interaction of rare gas clusters with intense vacuum ultraviolet radiation from the DESY free electron lasers has yielded many surprising results. In first experiments performed with 100 nm radiation at power densities up to 1013 W/cm2 the clusters disintegrated completely in a strong Coulomb explosion and kinetic energies of the resulting ions up to a few keV were measured.
We have investigated the interaction of intense light pulses from the FLASH - FEL below (32 nm) and in (13 nm) the Xe giant 4d resonance at power densities up to 1015 W/cm2. The data show for resonant excitation significantly higher charge states and higher kinetic energies of the ions leaving the cluster. However, both experiments at short wavelength exhibit lower energy absorption compared to the previous investigations at 100 nm. In addition to the wavelength dependence, the data will be discussed in terms of cluster size and laser intensity.