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The new short-pulse X-ray sources, realized at DESY in Hamburg with a
free electron laser (FEL) and with a similar concept under construction
in Stanford will open a new, so far unexplored, parameter regime in the
interaction of laser light with matter. First experiments with radiation
of 90 nm wavelength in Hamburg irradiating rare gas clusters have shown
an enormous absorption of energy resulting in multiply charged ionic
fragments [1]. This interesting and unexpected results have sparked
several theoretical explanations [2, 3].
Based on a mixed quantum/classical approach developed initially for clusters exposed to intense optical laser pulses [4, 5] and extended to the VUV regime [3], we have systematically explored the interaction of Xenon clusters with soft X-ray FEL radiation as a function of the wavelength of the light and of the cluster size. We have also investigated how XUV atto-second probe pulses can be used to experimentally check the various VUV absorption models. References [1] Hubertus Wabnitz et al. Nature 420, 482 (2002). [2] Robin Santra & Chris H Greene Phys. Rev. Lett. 91, 233401 (2003). [3] Christian Siedschlag & Jan M Rost Phys. Rev. Lett. 93, 043402 (2004). [4] Christian Siedschlag & Jan M Rost Phys. Rev. Lett. 89, 173401 (2002). [5] Ulf Saalmann & Jan M Rost Phys. Rev. Lett. 91, 223401 (2003). |