Keywords

plasma oscillations, expansion, ultracold neutral plasma, electron density distribution, electron gas, hydrodynamic model

Abstract

We report the observation of plasma oscillations in an ultracold neutral plasma. With this collective mode we probe the electron density distribution and study the expansion of the plasma as a function of time. For classical plasma conditions, i.e., weak Coulomb coupling, the expansion is dominated by the pressure of the electron gas and is described by a hydrodynamic model. Discrepancies between the model and observations at low temperature and high density may be due to strong coupling of the electrons.

Original Publication Citation

S. Kulin, T. C. Killian, S. D. Bergeson and S. L. Rolston, “Plasma oscillations and expansion of an ultracold neutral plasma,” Physical Review Letters, 85, 318-321 (2). The original publication of this article can be found at http://link.aps.org/doi/1.113/PhysRevLett.85.318