Electron dynamics of shocked polyethylene crystal
Abstract
Electron force field (eFF) wave-packet molecular-dynamics simulations of the single shock Hugoniot are reported for a crystalline polyethylene (PE) model. The eFF results are in good agreement with previous density-functional theories and experimental data, which are available up to 80 GPa. We predict shock Hugoniots for PE up to 350 GPa. In addition, we analyze the structural transformations that occur due to heating. Our analysis includes ionization fraction, molecular decomposition, and electrical conductivity during isotropic compression. We find that above a compression of 2.4 g/cm^3, the PE structure transforms into an atomic fluid, leading to a sharp increase in electron ionization and a significant increase in system conductivity. eFF accurately reproduces shock pressures and temperatures for PE along the single shock Hugoniot.
Additional Information
© 2012 American Physical Society. Received 12 January 2012; published 22 March 2012. This material is based upon work supported by the Department of Energy National Nuclear Security Administration under Award Number DE-FC52-08NA28613 (Caltech PSAAP). P.T. would like to thank John Aidun, Aidan Thompson, and Thomas Mattsson for hosting him at Sandia National Laboratories, where part of this work was initiated. Sandia National Laboratories is a multiprogram laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the US Department of Energy's National Nuclear Security Administration under Contract No. DE-AC04-94AL85000.Attached Files
Published - Theofanis2012p17778Phys_Rev_B.pdf
Supplemental Material - README.TXT
Supplemental Material - SupplementalMaterial.pdf
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Additional details
- Eprint ID
- 30118
- Resolver ID
- CaltechAUTHORS:20120417-084050984
- DE-FC52-08NA28613
- Department of Energy National Nuclear Security Administration
- DE-AC04-94AL85000
- Department of Energy National Nuclear Security Administration
- Created
-
2012-04-17Created from EPrint's datestamp field
- Updated
-
2021-11-09Created from EPrint's last_modified field
- Other Numbering System Name
- WAG
- Other Numbering System Identifier
- 0974