Ergodic model for the expansion of spherical nanoplasmas

Details Ergodic model for the expansion of spherical nanoplasmas Ergodic model for the expansion of spherical nanoplasmas

2007-04-24

arxiv.org/abs/0704.3211v1

Physics

Plasma Physics

To appear on Physical Review E

Scientific paper

10.1103/PhysRevE.75.066403

Recently, the collisionless expansion of spherical nanoplasmas has been analyzed with a new ergodic model, clarifying the transition from hydrodynamic-like to Coulomb-explosion regimes, and providing accurate laws for the relevant features of the phenomenon. A complete derivation of the model is here presented. The important issue of the self-consistent initial conditions is addressed by analyzing the initial charging transient due to the electron expansion, in the approximation of immobile ions. A comparison among different kinetic models for the expansion is presented, showing that the ergodic model provides a simplified description, which retains the essential information on the electron distribution, in particular, the energy spectrum. Results are presented for a wide range of initial conditions (determined from a single dimensionless parameter), in excellent agreement with calculations from the exact Vlasov-Poisson theory, thus providing a complete and detailed characterization of all the stages of the expansion.

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