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AIP conference proceedings

Liquid and solid atomic ion plasmas

J. J. Bollinger, S. L. Gilbert, Daniel J. Heinzen, Wayne M. Itano, D. J. Wineland

Published Jan 1, 1990• 0 citations
Publisher

Abstract

Atomic ions which are stored in electromagnetic traps can be viewed as one component plasmas. When the ions are laser cooled they become strongly coupled (Γ≳100) and exhibit liquid‐like and solid‐like behavior. Experimental evidence for this behavior is discussed for nonneutral 9Be+ ion plasmas stored in a Penning ion trap.
DOI
10.1063/1.39282

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We have determined the temperature and heating rate of laser-cooled ions in a Penning trap using Doppler laser spectroscopy. Between and ions are trapped in a Penning trap and Doppler laser cooled to temperatures of a few millikelvin, where they form ion crystals. This system is an example of a strongly coupled one-component plasma. The ion temperature was measured as a function of time after turning off the laser-cooling. In the solid phase, we measured a heating rate of . Information about possible heating mechanisms was obtained directly from temperature measurements, and also from measurements of the rate of radial expansion of the ion plasma. We determined that the observed heating is due to collisions with the residual gas of our vacuum system.