Berlin 2005 – wissenschaftliches Programm

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SYPS: Plasmen in ungewöhnlichen Situationen

SYPS 2: Symposium: Plasmas in unusual situations, Part II: Laser generated plasmas

SYPS 2.3: Hauptvortrag

Montag, 7. März 2005, 15:00–15:30, HU Audimax

Metal clusters under short and intense laser pulses — •K.H. Meiwes-Broer, T. Döppner, Th. Fennel, P. Radcliffe, A. Przystawik, and J. Tiggesbäumker — Fachbereich Physik, Universität Rostock, Universitätsplatz 3, 18051 Rostock

The interaction of metal clusters with intense laser light fields leads to a giant up-charging and subsequent Coulomb explosion. Most interestingly, it has been shown that for free metal clusters the highest charge states of the ionic fragments are not produced with the shortest laser pulses (and hence the highest intensity of 1.5× 10¹⁶ W/cm²) but with stretched pulses having a width of 600 fs to 1000 fs [1]. This phenomenon we currently attribute to plasmon enhanced ionization. Studying the charging dynamics using the femtosecond dual-pulse technique gives a much higher time resolution and simplifies the interpretation of the experimental findings. Applying this method to free clusters and those which are embedded in helium droplets, reveals a significant influence of charge transfer processes [2]. The experimental results will be discussed in view of Vlasov simulations [3].

[1] L. Köller, M. Schumacher, J. Köhn, S. Teuber, J. Tiggesbäumker, and K.H. Meiwes-Broer, Phys. Rev. Lett. 82, 3783 (1999).

[2] T. Döppner, S. Teuber, Th. Diederich, Th. Fennel, P. Radcliffe, J. Tiggesbäumker, and K.H. Meiwes-Broer, Eur. Phys. J. D 24, 157 (2003).

[3] Th. Fennel, G. Bertsch, and K.H. Meiwes-Broer, Eur. Phys. J. D 29, 367 (2004).