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Ion Acoustic Waves in Ultracold Neutral Plasmas (1005.4670v1)
Published 25 May 2010 in physics.plasm-ph and physics.atom-ph
Abstract: We photoionize laser-cooled atoms with a laser beam possessing spatially periodic intensity modulations to create ultracold neutral plasmas with controlled density perturbations. Laser-induced fluorescence imaging reveals that the density perturbations oscillate in space and time, and the dispersion relation of the oscillations matches that of ion acoustic waves, which are long-wavelength, electrostatic, density waves.
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