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Liquid structure of shock-compressed hydrocarbons at megabar pressures

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Hartley, N. J., Vorberger, J., Döppner, T., Cowan, T., Falcone, R. W., Fletcher, L. B., Frydrych, S., Galtier, E., Gamboa, E. J., Gericke, D. O. et al.
(2018) Liquid structure of shock-compressed hydrocarbons at megabar pressures. Physical Review Letters, 121 (24). 245501. doi:10.1103/PhysRevLett.121.245501 ISSN 0031-9007.

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.121.245501

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Abstract

We present results for the ionic structure in hydrocarbons (polystyrene, polyethylene) that were shock compressed to pressures of up to 190 GPa, inducing rapid melting of the samples. The structure of the resulting liquid is then probed using in situ diffraction by an x-ray free electron laser beam, demonstrating the capability to obtain reliable diffraction data in a single shot, even for low-
Z
samples without long range order. The data agree well with ab initio simulations, validating the ability of such approaches to model mixed samples in states where complex interparticle bonds remain, and showing that simpler models are not necessarily valid. While the results clearly exclude the possibility of complete carbon-hydrogen demixing at the conditions probed, they also, in contrast to previous predictions, indicate that diffraction is not always a sufficient diagnostic for this phenomenon.

Item Type: Journal Article
Subjects: Q Science > QD Chemistry
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Hydrocarbons -- Research, Ionic structure, Materials -- Compression testing, Shock (Mechanics)
Journal or Publication Title: Physical Review Letters
Publisher: American Physical Society
ISSN: 0031-9007
Official Date: 14 December 2018
Dates:
DateEvent
14 December 2018Published
UNSPECIFIEDAccepted
Volume: 121
Number: 24
Article Number: 245501
DOI: 10.1103/PhysRevLett.121.245501
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: © 2018 American Physical Society
Date of first compliant deposit: 10 January 2020
Date of first compliant Open Access: 10 January 2020
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
FWP 1001182[DOE] U.S. Department of Energyhttp://dx.doi.org/10.13039/100000015
VH-NG1141Helmholtz Associationhttp://dx.doi.org/10.13039/501100009318
16K17846[JSPS] Japan Society for the Promotion of Sciencehttp://dx.doi.org/10.13039/501100001691
DE-AC52-07NA27344Lawrence Livermore National Laboratoryhttp://dx.doi.org/10.13039/100006227
18-ERD-033Laboratory Directed Research and Developmenthttp://dx.doi.org/10.13039/100007000
05P15RDFA1Bundesministerium für Bildung, Wissenschaft, Forschung und Technologiehttp://dx.doi.org/10.13039/501100010571
DE-SC0018298[DOE] U.S. Department of Energyhttp://dx.doi.org/10.13039/100000015

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