Abstract
The energy absorption of rare gas clusters irradiated by an intense ultrashort laser pulse is studied numerically. Various mechanisms of collisionless energy absorption were evaluated and discussed. The molecular dynamics simulations results suggest that both the linear and nonlinear resonance absorption mechanisms are marginally relevant. A capacitor model is considered that links the energy absorption to outer electron ionization and volume distribution of charges, rather than oscillation of electrons and transition through a resonance. It predicts correctly the absolute absorbed energy, as well as the dependence of the absorbed energy versus number of atoms per cluster.
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