Determining the refractive index of shocked [100] lithium fluoride to the limit of transmissibility

Rigg, P. A.; Knudson, Marcus D.; Scharff, R. Jason; Hixson, R. S.

doi:10.1063/1.4890714

Cited by 117 publications

(28 citation statements)

References 35 publications

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“…5 shows the calculated real part of the index of refraction, n. We consider both n(ω = 0) and n(λ = 532nm) ( ω = 2.33 eV), as in recent experiments 8,11 where n was additionally determined in the infrared (λ = 1550 nm). We see that our calculated n increases almost linearly with ρ, but with a slight downward curvature.…”

Section: B Index Of Refraction At Elevated Pressuresmentioning

confidence: 99%

“…This was later modified by Rigg et al 11 , who performed more measurements along the shock Hugoniot and determined quadratic corrections to this linear behavior. The work of Fratanduono et al 10 used laser drives and ramp compression to access much larger densities (up to ρ ∼ 7 g/cm 3 , [ρ/ρ 0 ] ∼ 3, P up to 8 Mbar), and inferred a linear increase of n with ρ over this whole range, consistent with the lower-compression data.…”

Section: Introductionmentioning

confidence: 99%

“…Several of these have focused specifically on its high-pressure optical properties, and have collectively determined the real part of the index of refraction, n, for densities up to just over 4 g/cm 3 (∼ 60% increase in density above ambient) 5,[8][9][10][11] .…”

Section: Introductionmentioning

confidence: 99%

“…Because of these applications (in addition to its fundamental interest as a prototypical wide-gap material) LiF itself has been the subject of a number of dynamic high-pressure experimental investigations [5][6][7][8][9][10][11] . Several of these have focused specifically on its high-pressure optical properties, and have collectively determined the real part of the index of refraction, n, for densities up to just over 4 g/cm 3 (∼ 60% increase in density above ambient) 5,[8][9][10][11] .…”

Section: Introductionmentioning

confidence: 99%

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Ab initiomany-body Green's function calculations of optical properties of LiF at high pressures

2015

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We present Density Functional Theory (DFT) + quasiparticle self-energy (G0W0) + BetheSalpeter calculations of the real and imaginary parts of the long-wavelength dielectric function of LiF between ambient pressure and P = 5 Mbar. While the optical absorption spectrum is predicted to show dramatic pressure-dependent features above the optical gap, the index of refraction well below the gap is shown to exhibit the same trends as that seen in both DFT calculations and experiment: a roughly linear increase with density. This increase does not result from a decrease in the band gap, but rather follows from the increase in oscillator strength which counteracts a smaller increase in band gap with P . Our calculations also suggest that the index of refraction (for visible and near-UV light) of the higher-T B2-phase should be quite close to that of the B1 (ambient crystalline) phase. These findings may be of interest to researchers who use LiF as a window material in dynamic compression experiments.

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Section: B Index Of Refraction At Elevated Pressuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ab initiomany-body Green's function calculations of optical properties of LiF at high pressures

2015

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“…7 Recent data to near 200 GPa along the Hugoniot, 8 however, indicate that n(ρ) is non-linear over this pressure range, and fit well by a power law of the form The presence of a small jump in apparent velocity at a time that corresponds to formation of a shock within the ramped compression pulse inside the window, as shown in Fig. 2(b), strongly suggests index has a temperature dependence such that, for a given density, n is lower on the isentrope than on the Hugoniot.…”

Section: Lithium Fluoride At Multi-megabar Pressurementioning

confidence: 99%

Results from new multi-megabar shockless compression experiments at the Z machine

Davis¹,

Knudson²,

Brown³

2017

AIP Conference Proceedings

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Detonation Characteristics of an Aluminized Explosive Added with Boron and Magnesium Hydride

Cao

Song

Gao

et al. 2019

Propellants Explo Pyrotec

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Investigation of the detonation characteristics of an aluminized explosive added with boron (B) and magnesium hydride (MgH 2 ) were undertaken and compared with the aluminized explosive of similar formulation. Firstly, the explosion heat was measured in a vacuumed calorimetric bomb, then the detonation pressure was determined by the interface velocity experiment, and finally the cylinder expansion test was performed. From the calorimetric data, the addition of B and MgH 2 into an aluminized explosive increases the heat of explosion slightly. From the detonation pressure data, the addition of B and MgH 2 appears to have no significant influence to the detonation pressure. From the cylinder test data, the detonation velocity, wall velocity, Gurney energy and detonation energy were determined. The aluminized explosive added with B and MgH 2 shows weak acceleration ability, but exhibits a stronger afterburning potential. Finally the equation of state of the detonation products was determined for different casing conditions. Conclusions about how to use B and MgH 2 in aluminized explosives to generate optimal effects are drawn.

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Determining the refractive index of shocked [100] lithium fluoride to the limit of transmissibility

Cited by 117 publications

References 35 publications

Ab initiomany-body Green's function calculations of optical properties of LiF at high pressures

Ab initiomany-body Green's function calculations of optical properties of LiF at high pressures

Results from new multi-megabar shockless compression experiments at the Z machine

Detonation Characteristics of an Aluminized Explosive Added with Boron and Magnesium Hydride

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