Electron release of rare gas atom clusters under an intense laser pulse

Abstract

Calculating the energy absorption of atomic clusters as a function of the laser pulse length $T$ we find a maximum for a critical $T^{\ast }$. We show that $T^{\ast }$ can be linked to an optimal cluster radius $R^{\ast }$. The existence of this radius can be attributed to the enhanced ionization mechanism originally discovered for diatomic molecules. Our findings indicate that enhanced ionization should be operative for a wide class of rare gas clusters. From a simple Coulomb explosion ansatz, we derive an analytical expression relating the maximum energy release to a suitably scaled expansion time which can be expressed with the pulse length $T^{\ast }$.

4 pages, 5 figures

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