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Title: Refractive index of lithium fluoride to 900 gigapascal and implications for dynamic equation of state measurements

Abstract

Lithium fluoride (LiF) is a unique crystal possessing the largest reported bandgap of any material and is predicted to remain transparent to visible light under stresses in excess of 1000 GPa. Dynamic compression experiments often utilize LiF as a window material to maintain stress on a sample while enabling direct measurements of interface velocity. However, typical velocimetry diagnostics measure changes in the optical path length; therefore, an accurate understanding of LiF’s equation of state and refractive index is needed. Here, we present a measurement of the LiF refractive index up to 900 GPa from a low-temperature ramp-compression experiment at the National Ignition Facility. To demonstrate propagation of optical uncertainty from this work to equation of state measurements, simulations in which a tin–LiF interface reaches a peak stress of 825 GPa show that the principal isentrope of tin can be determined up to 1450 GPa with a 1.2% uncertainty in density while considering uncertainties in the optical response of LiF.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1557060
Alternate Identifier(s):
OSTI ID: 1510158
Report Number(s):
LLNL-JRNL-767294
Journal ID: ISSN 0021-8979; 957376
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 125; Journal Issue: 17; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Kirsch, L. E., Ali, S. J., Fratanduono, D. E., Kraus, R. G., Braun, D. G., Fernandez-Pañella, A., Smith, R. F., McNaney, J. M., and Eggert, J. H. Refractive index of lithium fluoride to 900 gigapascal and implications for dynamic equation of state measurements. United States: N. p., 2019. Web. doi:10.1063/1.5091722.
Kirsch, L. E., Ali, S. J., Fratanduono, D. E., Kraus, R. G., Braun, D. G., Fernandez-Pañella, A., Smith, R. F., McNaney, J. M., & Eggert, J. H. Refractive index of lithium fluoride to 900 gigapascal and implications for dynamic equation of state measurements. United States. doi:10.1063/1.5091722.
Kirsch, L. E., Ali, S. J., Fratanduono, D. E., Kraus, R. G., Braun, D. G., Fernandez-Pañella, A., Smith, R. F., McNaney, J. M., and Eggert, J. H. Wed . "Refractive index of lithium fluoride to 900 gigapascal and implications for dynamic equation of state measurements". United States. doi:10.1063/1.5091722.
@article{osti_1557060,
title = {Refractive index of lithium fluoride to 900 gigapascal and implications for dynamic equation of state measurements},
author = {Kirsch, L. E. and Ali, S. J. and Fratanduono, D. E. and Kraus, R. G. and Braun, D. G. and Fernandez-Pañella, A. and Smith, R. F. and McNaney, J. M. and Eggert, J. H.},
abstractNote = {Lithium fluoride (LiF) is a unique crystal possessing the largest reported bandgap of any material and is predicted to remain transparent to visible light under stresses in excess of 1000 GPa. Dynamic compression experiments often utilize LiF as a window material to maintain stress on a sample while enabling direct measurements of interface velocity. However, typical velocimetry diagnostics measure changes in the optical path length; therefore, an accurate understanding of LiF’s equation of state and refractive index is needed. Here, we present a measurement of the LiF refractive index up to 900 GPa from a low-temperature ramp-compression experiment at the National Ignition Facility. To demonstrate propagation of optical uncertainty from this work to equation of state measurements, simulations in which a tin–LiF interface reaches a peak stress of 825 GPa show that the principal isentrope of tin can be determined up to 1450 GPa with a 1.2% uncertainty in density while considering uncertainties in the optical response of LiF.},
doi = {10.1063/1.5091722},
journal = {Journal of Applied Physics},
number = 17,
volume = 125,
place = {United States},
year = {2019},
month = {5}
}

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