Darmstadt 2008 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 1: Attosecond electron dynamics

A 1.6: Vortrag

Montag, 10. März 2008, 15:30–15:45, 3C

Creating and monitoring non-equillibrium plasmas with attosecond laser pulses — •Ionuţ Georgescu, Ulf Saalmann, and Jan-Michael Rost — Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, 01187 Dresden, Germany

It has been shown by means of microscopic calculations that the charging of rare-gas clusters exposed to VUV laser pulses from an FEL can be traced with attosecond XUV laser pulses by measuring the kinetic energy of the photo electrons detached by the latter in a pump-probe experiment [1]. Given the rapid development of high-harmonic sources, it will soon be possible to implement this scheme in a table-top experiment, where both the VUV pump and the XUV probe can be generated from the same IR pulse. We show that with pump pulses as short as one femtosecond the charging process is accompanied by the formation of a nano-plasma, whose properties leave a strong fingerprint on the result of the probe. We predict that pump and probe pulses as short as 250 attoseconds can induce a and monitor the dynamics of a nano-plasma far from equilibrium, whose relaxation patterns resemble those of ultra-cold "micro-plasmas" [2].
[1] I. Georgescu, U. Saalmann and J.M. Rost Phys. Rev. Lett. 99, 183002 (2007)
T.C. Killian, T. Pattard, T. Pohl and J.M. Rost Phys. Rep. 449, 77 (2007)