Electric microfields in dense carbon-hydrogen plasmas
Abstract
Classical molecular dynamics is used to investigate stationary and time-dependent properties of microfields in hot, solid density, electron-ion plasmas. Even at the high temperatures considered here, such simulations require quantum statistical potentials (QSPs) to mimic the essential effects of diffraction and exchange symmetry for electrons. Fortunately, key results relevant to microfield distributions are found to be insensitive to different, plausible QSP choices. Atomic processes in plasmas will depend on the time average of the microfields. It is not clear, a priori, what the time duration of this average should be. The question of how best to extract the quasistatic (low-frequency) microfield from a classical molecular dynamics simulation is explored in some detail, and the time-averaging approach we adopt involves both plasma and atomic time scale constraints. One of the major findings described in the paper is that for a large time interval, the time-averaged microfield does not significantly change. Our discussion of this suite of large simulations for plasma mixtures focuses on understanding various features and trends revealed by data for C-H plasmas having carbon fractions ranging from 0.01 to 1, and different temperatures well above TFermi.
- Authors:
-
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Univ. of Pittsburgh, PA (United States). Dept. of Physics and Astronomy
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1809153
- Alternate Identifier(s):
- OSTI ID: 1180041
- Report Number(s):
- LLNL-JRNL-659900
Journal ID: ISSN 1539-3755; 781059; TRN: US2212969
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
- Additional Journal Information:
- Journal Volume: 91; Journal Issue: 3; Journal ID: ISSN 1539-3755
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS
Citation Formats
Hau-Riege, Stefan, and Weisheit, Jon. Electric microfields in dense carbon-hydrogen plasmas. United States: N. p., 2015.
Web. doi:10.1103/physreve.91.033106.
Hau-Riege, Stefan, & Weisheit, Jon. Electric microfields in dense carbon-hydrogen plasmas. United States. https://doi.org/10.1103/physreve.91.033106
Hau-Riege, Stefan, and Weisheit, Jon. Wed .
"Electric microfields in dense carbon-hydrogen plasmas". United States. https://doi.org/10.1103/physreve.91.033106. https://www.osti.gov/servlets/purl/1809153.
@article{osti_1809153,
title = {Electric microfields in dense carbon-hydrogen plasmas},
author = {Hau-Riege, Stefan and Weisheit, Jon},
abstractNote = {Classical molecular dynamics is used to investigate stationary and time-dependent properties of microfields in hot, solid density, electron-ion plasmas. Even at the high temperatures considered here, such simulations require quantum statistical potentials (QSPs) to mimic the essential effects of diffraction and exchange symmetry for electrons. Fortunately, key results relevant to microfield distributions are found to be insensitive to different, plausible QSP choices. Atomic processes in plasmas will depend on the time average of the microfields. It is not clear, a priori, what the time duration of this average should be. The question of how best to extract the quasistatic (low-frequency) microfield from a classical molecular dynamics simulation is explored in some detail, and the time-averaging approach we adopt involves both plasma and atomic time scale constraints. One of the major findings described in the paper is that for a large time interval, the time-averaged microfield does not significantly change. Our discussion of this suite of large simulations for plasma mixtures focuses on understanding various features and trends revealed by data for C-H plasmas having carbon fractions ranging from 0.01 to 1, and different temperatures well above TFermi.},
doi = {10.1103/physreve.91.033106},
journal = {Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics},
number = 3,
volume = 91,
place = {United States},
year = {Wed Mar 11 00:00:00 EDT 2015},
month = {Wed Mar 11 00:00:00 EDT 2015}
}
Web of Science
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