@article{f23c796520024b27a0c23ac7a343948d,
title = "Using higher ionization states to increase Coulomb coupling in an ultracold neutral plasma",
abstract = "We report measurements and simulations of the time-evolving rms velocity distribution in an ultracold neutral plasma. A strongly coupled ultracold neutral Ca+ plasma is generated by photoionizing laser-cooled atoms close to threshold. A fraction of these ions is then promoted to the second ionization state to form a mixed Ca+-Ca2+ plasma. By varying the time delay between the first and the second ionization events, a minimum in ion heating is achieved. We show that the Coulomb strong-coupling parameter Γ increases by a factor of 1.4 to a maximum value of 3.6. A pure Ca2+ plasma would have Γ=6.8, moving these strongly coupled systems closer to the regime of liquid-like correlations.",
author = "M. Lyon and Bergeson, {S. D.} and A. Diaw and Murillo, {M. S.}",
note = "Publisher Copyright: {\textcopyright} 2015 American Physical Society.",
year = "2015",
month = mar,
day = "2",
doi = "10.1103/PhysRevE.91.033101",
language = "English",
volume = "91",
journal = "Physical Review E - Statistical, Nonlinear, and Soft Matter Physics",
issn = "1539-3755",
publisher = "American Physical Society",
number = "3",
}