ion, ion coupling, ultracold plasma, electron screening
We show that strong coupling between ions in an ultracold neutral plasma is limited by electron screening. While electron screening reduces the quasiequilibrium ion temperature, it also reduces the ion-ion electrical potential energy. The net result is that the ratio of nearest-neighbor potential energy to kinetic energy in quasiequilibrium is constant and limited to approximately 1 unless the electrons are heated by some external source. We support these conclusions by reporting measurements of the ion velocity distribution in an ultracold neutral calcium plasma. These results match previously reported simulations of Yukawa systems. Theoretical considerations are used to determine the screened nearest-neighbor potential energy in the plasma.
Original Publication Citation
M. Lyon, S. D. Bergeson, and M. S. Murillo. Limit of strong ion coupling due to electron shielding. Phys. Rev. E 87 (3), 033101 (2013).
BYU ScholarsArchive Citation
Lyon, M.; Bergeson, Scott D.; and Murillo, M. S., "Limit of Strong Ion Coupling due to Electron Shielding" (2013). All Faculty Publications. 1836.
American Physical Society
Physical and Mathematical Sciences
Physics and Astronomy
© 2013 American Physical Society. This article is the Version of Record published by the American Physical Society in Physical Review E in 2013, available online at https://doi.org/10.1103/PhysRevE.87.033101
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