Fluorescence measurements of expanding strongly coupled neutral plasmas.
We report new detailed density profile measurements in expanding strongly coupled neutral calcium plasmas. Using laser-induced fluorescence techniques, we determine plasma densities in the range of 10(5) to 10(9) cm(-3) to with a time resolution limit as small as 7 ns. Strong coupling in the plasma ions is inferred directly from the fluorescence signals. Evidence for strong coupling at late times is presented, confirming a recent theoretical result.
Cummings
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Brigham Young University, Department of Physics and Astronomy, Provo, Utah 84602, USA.
Daily
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Durfee
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Bergeson
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