Berlin 2001 – wissenschaftliches Programm

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A: Atomphysik

A 1: Posters Monday (Cluster, Atoms in Fields)

A 1.1: Poster

Montag, 2. April 2001, 12:30–15:00, AT3

Time dependent energy absorption of atomic clusters from an intense laser pulse — •Christian Siedschlag and Jan-Michael Rost — MPIPKS Dresden, Nöthnitzer Strasse 38, 01187 Dresden

For the energy absorption of atomic clusters as a function of the laser pulse duration we find a similar behavior as it has been observed for metallic clusters (Köller et. al. PRL 82, 3783 (1999)) In both situations there exists an optimum radius R₀ of the cluster for energy absorption. In the metallic case the existence of R₀ has been interpreted as a consequence of the collective oscillation of a delocalized electron cloud in resonance with the laser frequency. Here, we give evidence that in the atomic cluster the origin of R₀ is very different. Based on field assisted tunneling it can be related to the phenomenon of enhanced ionization in small molecules. The dependence of R₀ on the laser frequency turns out to be the key quantity to distinguish the processes.