Abstract

We present calculations showing that ionization of ${\mathrm{Xe}}_{N}$ $(N=108--1524)$ clusters by intense femtosecond lasers is governed by two mechanisms that have their origin in molecular and plasma physics, respectively. Optimal-control calculations show that a three-pulse sequence optimizes cluster ionization and involves both enhanced ionization and resonant driving of collective electron oscillations. As a result we can understand how ionization in intense laser fields evolves from small molecules to large clusters.

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