Cluster ionization via two-plasmon excitation

Details Cluster ionization via two-plasmon excitation Cluster ionization via two-plasmon excitation

1999-01-09

arxiv.org/abs/physics/9901008v1

Phys. Rev. A, 61 (2000) 033202

Physics

Atomic and Molecular Clusters

17 pages and 6 PostScript figures

Scientific paper

10.1103/PhysRevA.61.033202

We calculate the two-photon ionization of clusters for photon energies near the surface plasmon resonance. The results are expressed in terms of the ionization rate of a double plasmon excitation, which is calculated perturbatively. For the conditions of the experiment by Schlipper et al., we find an ionization rate of the order of 0.05-0.10 fs^(-1). This rate is used to determine the ionization probability in an external field in terms of the number of photons absorbed and the duration of the field. The probability also depends on the damping rate of the surface plasmon. Agreement with experiment can only be achieved if the plasmon damping is considerably smaller than its observed width in the room-temperature single-photon absorption spectrum.

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