Laser-Cluster-Interaction in a Nanoplasma-Model with Inclusion of   Lowered Ionization Energies
  The interaction of intense laser fields with silver and argon clusters is investigated theoretically using a modified nanoplasma model. Single pulse and double pulse excitations are considered. The influence of the dense cluster environment on the inner ionization processes is studied including the lowering of the ionization energies. There are considerable changes in the dynamics of the laser-cluster interaction. Especially, for silver clusters, the lowering of the ionization energies leads to increased yields of highly charged ions. 
Paul Hilse, Max Moll, Manfred Schlanges, and Thomas Bornath