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Title: Path integral Monte Carlo simulations of dense carbon-hydrogen plasmas

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.5001208· OSTI ID:1474357
ORCiD logo [1];  [2];  [3]; ORCiD logo [2];  [3];  [1]
  1. Univ. of California, Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of California, Berkeley, CA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Carbon-hydrogen plasmas and hydrocarbon materials are of broad interest to laser shock experimentalists, high energy density physicists, and astrophysicists. Accurate equations of state (EOSs) of hydrocarbons are valuable for various studies from inertial confinement fusion to planetary science. By combining path integral Monte Carlo (PIMC) results at high temperatures and density functional theory molecular dynamics results at lower temperatures, we compute the EOSs for hydrocarbons from simulations performed at 1473 separate (ρ, T)-points distributed over a range of compositions. These methods accurately treat electronic excitation effects with neither adjustable parameter nor experimental input. PIMC is also an accurate simulation method that is capable of treating many-body interaction and nuclear quantum effects at finite temperatures. These methods therefore provide a benchmark-quality EOS that surpasses that of semi-empirical and Thomas-Fermi-based methods in the warm dense matter regime. By comparing our first-principles EOS to the LEOS 5112 model for CH, we validate the specific heat assumptions in this model but suggest that the Grüneisen parameter is too large at low temperatures. Based on our first-principles EOSs, we predict the principal Hugoniot curve of polystyrene to be 2%-5% softer at maximum shock compression than that predicted by orbital-free density functional theory and SESAME 7593. By investigating the atomic structure and chemical bonding of hydrocarbons, we show a drastic decrease in the lifetime of chemical bonds in the pressure interval from 0.4 to 4 megabar. We find the assumption of linear mixing to be valid for describing the EOS and the shock Hugoniot curve of hydrocarbons in the regime of partially ionized atomic liquids. We make predictions of the shock compression of glow-discharge polymers and investigate the effects of oxygen content and C:H ratio on its Hugoniot curve. In conclusion, our full suite of first-principles simulation results may be used to benchmark future theoretical investigations pertaining to hydrocarbon EOSs and should be helpful in guiding the design of future experiments on hydrocarbons in the gigabar regime.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344; NA0001859; SC0010517; SC0016248
OSTI ID:
1474357
Alternate ID(s):
OSTI ID: 1420621
Report Number(s):
LLNL-JRNL-736960; 889714
Journal Information:
Journal of Chemical Physics, Vol. 148, Issue 10; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

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Cited By (9)

Preface: Special Topic on Nuclear Quantum Effects journal March 2018
Understanding the effects of radiative preheat and self-emission from shock heating on equation of state measurement at 100s of Mbar using spherically converging shock waves in a NIF hohlraum journal January 2020
High Pressure Hydrocarbons Revisited: From van der Waals Compounds to Diamond journal May 2019
Equation of state of boron nitride combining computation, modeling, and experiment journal April 2019
First-Principles Equation of State Database for Warm Dense Matter Computation text January 2020
Nonideal Mixing Effects in Warm Dense Matter Studied with First-Principles Computer Simulations text January 2020
Magnesium oxide at extreme temperatures and pressures studied with first-principles simulations journal December 2019
Development and modeling of a polar-direct-drive exploding pusher platform at the National Ignition Facility journal July 2018
Application of quantum-statistical methods to studies of thermodynamic and radiative processes in hot dense plasmas journal September 2019

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