Kinetic energy oscillations in annular regions of ultracold neutral plasmas |
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| Authors: | S. Laha Y. C. Chen P. Gupta C. E. Simien Y. N. Martinez P. G. Mickelson S. B. Nagel T. C. Killian |
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| Affiliation: | (1) Department of Physics and Astronomy and Rice Quantum Institute, Rice University, Houston, Texas 77005, USA;(2) Institute of Atomic and Molecular Sciences Academia Sinica, P.O. Box 23, Taipei, 106, Taiwan |
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| Abstract: | A study of ion equilibration in annular regions of ultracold strontium plasmas is reported. Plasmas are formed by photoionizing laser-cooled atoms with a pulsed dye laser. The experimental probe is spatially-resolved absorption spectroscopy using the 2S1/2-2P1/2 transition of the Sr+ ion. The kinetic energy of the ions is calculated from the Doppler broadening of the spectrum, and it displays clear oscillations during the first microsecond after plasma formation. The oscillations, which are a characteristic of strong coulomb coupling, are fit with a simple phenomenological model incorporating damping and density variation in the plasma. |
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| Keywords: | 52.35.-g Waves, oscillations, and instabilities in plasmas and intense beams 32.80.Fb Photoionization of atoms and ions 32.80.Pj Optical cooling of atoms trapping |
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