Time dependent energy absorption of atomic clusters from an intense laser pulse

Details Time dependent energy absorption of atomic clusters from an intense laser pulse Time dependent energy absorption of atomic clusters from an intense laser pulse

2000-11-29

arxiv.org/abs/physics/0011070v1

Physics

Atomic and Molecular Clusters

4 pages, 3 figures

Scientific paper

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 [K\"oller et al., Phys. Rev. Lett. {\bf 82}, 3783 (1999)]. In both situations there exists an optimum radius $R_{o}$ of the cluster for energy absorption. In the metallic case the existence of $R_{o}$ 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 $R_{o}$ is very different. Based on field assisted tunneling it can be related to the phenomenon of enhanced ionization as it occurs in small molecules. The dependence of $R_{o}$ on the laser frequency turns out to be the key quantity to distinguish the processes.

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