- Access by Xinjiang University
Thermodynamic state variables in quasiequilibrium ultracold neutral plasma
Phys. Rev. E 95, 043204 – Published 13 April, 2017
DOI: https://doi.org/10.1103/PhysRevE.95.043204
Abstract
The pressure and internal energy of an ultracold plasma in a state of quasiequilibrium are evaluated using classical molecular dynamics simulations. Coulomb collapse is avoided by modeling electron-ion interactions using an attractive Coulomb potential with a repulsive core. We present a method to separate the contribution of classical bound states, which form due to recombination, from the contribution of free charges when evaluating these thermodynamic state variables. It is found that the contribution from free charges is independent of the choice of repulsive core length scale when it is sufficiently short-ranged. The partial pressure associated with the free charges is found to closely follow that of the one-component plasma model, reaching negative values at strong coupling, while the total system pressure remains positive. This pseudopotential model is also applied to Debye-Hückel theory to describe the weakly coupled regime.
Physics Subject Headings (PhySH)
Article Text
References (33)
- A. Diaw and M. S. Murillo, Phys. Rev. E 92, 013107 (2015).
- T. S. Strickler, T. K. Langin, P. McQuillen, J. Daligault, and T. C. Killian, Phys. Rev. X 6, 021021 (2016).
- R. Drake, High-Energy-Density Physics: Fundamentals, Inertial Fusion, and Experimental Astrophysics. Shock Wave and High Pressure Phenomena (Springer, Berlin, 2006).
- R. Redmer and G. Röpke, Contrib. Plasma Phys. 50, 970 (2010).
- K. A. Brueckner and S. Jorna, Rev. Mod. Phys. 46, 325 (1974).
- M. Baus and J.-P. Hansen, Phys. Rep. 59, 1 (1980).
- M. Baus, J. Phys. A: Math. Gen. 11, 2451 (1978).
- M. Bonitz, B. B. Zelener, B. V. Zelener, E. A. Manykin, V. S. Filinov, and V. E. Fortov, J. Exp. Theor. Phys. 98, 719 (2004).
- T. C. Killian, S. Kulin, S. D. Bergeson, L. A. Orozco, C. Orzel, and S. L. Rolston, Phys. Rev. Lett. 83, 4776 (1999).
- T. C. Killian, Science 316, 705 (2007).
- T. Killian, T. Pattard, T. Pohl, and J. Rost, Phys. Rep. 449, 77 (2007).
- F. Robicheaux and J. D. Hanson, Phys. Rev. Lett. 88, 055002 (2002).
- T. C. Killian, M. J. Lim, S. Kulin, R. Dumke, S. D. Bergeson, and S. L. Rolston, Phys. Rev. Lett. 86, 3759 (2001).
- L. Guo, R. H. Lu, and S. S. Han, Phys. Rev. E 81, 046406 (2010).
- S. G. Kuzmin and T. M. ONeil, Phys. Plasmas 9, 3743 (2002).
- S. G. Kuzmin and T. M. O'Neil, Phys. Rev. Lett. 88, 065003 (2002).
- S. Mazevet, L. A. Collins, and J. D. Kress, Phys. Rev. Lett. 88, 055001 (2002).
- V. E. Fortov and I. Iakubov, The Physics of Non-ideal Plasma (World Scientific, Singapore, 2000).
- I. Klimontovich, The Statistical Theory of Non-equilibrium Processes in a Plasma, International Series of Monographs in Natural Philosophy (MIT Press, Cambridge, MA, 1967).
- D. J. Evans and B. L. Holian, J. Chem. Phys. 83, 4069 (1985).
- C. Deutsch, Phys. Lett. A 60, 317 (1977).
- G. Kelbg, Ann. Phys. 467, 354 (1963).
- J. Taylor, Classical Mechanics (University Science Books, Herndon, VA, 2004).
- R. S. Fletcher, X. L. Zhang, and S. L. Rolston, Phys. Rev. Lett. 99, 145001 (2007).
- T. Hill, An Introduction to Statistical Thermodynamics, Dover Books on Physics (Dover, Mineola, NY, 2012).
- F. Chen, Introduction to Plasma Physics (Plenum Press, New York, 1974).
- S. D. Baalrud and J. Daligault, Phys. Plasmas 21, 055707 (2014).
- J. P. Hansen and I. R. McDonald, Phys. Rev. A 23, 2041 (1981).
- E. H. Lieb, Rev. Mod. Phys. 48, 553 (1976).
- S. Plimpton, J. Comput. Phys. 117, 1 (1995).
- G. Dimonte and J. Daligault, Phys. Rev. Lett. 101, 135001 (2008).
- S. Plimpton, R. Pollock, and M. Stevens, in Proceedings of the Eighth SIAM Conference on Parallel Processing for Scientific Computing, PPSC 1997, Minneapolis, Minnesota, USA, March 14–17, 1997 (Society for Industrial and Applied Mathematics, Philadelphia, 1997).
- J. N. Glosli, F. R. Graziani, R. M. More, M. S. Murillo, F. H. Streitz, M. P. Surh, L. X. Benedict, S. Hau-Riege, A. B. Langdon, and R. A. London, Phys. Rev. E 78, 025401 (2008).