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A: Fachverband Atomphysik

A 12: Atomic Clusters I

A 12.3: Vortrag

Mittwoch, 10. März 2010, 15:00–15:15, F 303

Clusters in XUV laser pulses: Electron emission and nanoplasma dynamics — •Mathias Arbeiter und Thomas Fennel — Institute of Physics, University of Rostock

The excitation mechanisms of clusters exposed to intense laser fields in the VUV and XUV domain strongly differ from the response behavior in the near-infrared wavelength range. Whereas the heating of delocalized electrons in the nanoplasma is the dominant energy capture mechanism in optical fields, energy absorption due to the excitation of localized electrons, i.e. by the inner ionization processes itself, becomes increasingly important at high photon energy. Further, the formation of a nanoplasma is substantially delayed because of direct electron excitation into the continuum. The resulting signatures in electron energy spectra^[1] can be described by a multi-step ionization scheme^[2].

In addition, future prospects will be addressed for XUV pump-and-probe experiments, e.g. for monitoring nanoplasma built-up, cluster expansion and dark plasmon modes.

[1] C. Bostedt et al., Phys. Rev. Lett. 100, 133401 (2008)

[2] M. Arbeiter, Th. Fennel, in preparation