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

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.

doi:10.1063/1.5091722

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

Journal Article · Wed May 01 00:00:00 EDT 2019 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.5091722· OSTI ID:1545328

^[1]; Ali, S. J. ^[1]; Fratanduono, D. E. ^[1]; Kraus, R. G. ^[1]; Braun, D. G. ^[1]; Fernandez-Pañella, A. ^[1]; Smith, R. F. ^[1]; McNaney, J. M. ^[1]; Eggert, J. H. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1545328

Alternate ID(s):: OSTI ID: 1510158
OSTI ID: 1557060

Report Number(s):: LLNL-JRNL-767294; IM #957376

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 17 Vol. 125; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Coordination changes in liquid tin under shock compression determined using in situ femtosecond x-ray diffraction Briggs, R.; Gorman, M. G.; Zhang, S. Applied Physics Letters, Vol. 115, Issue 26 https://doi.org/10.1063/1.5127291	journal	December 2019
Path integral Monte Carlo and density functional molecular dynamics simulations of warm dense MgSiO 3 González-Cataldo, Felipe; Soubiran, François; Peterson, Henry Physical Review B, Vol. 101, Issue 2 https://doi.org/10.1103/physrevb.101.024107	journal	January 2020

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