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Title: Luminescence from Edge Fracture in Shocked Lithium Fluoride Crystals

Abstract

Light emitted from a [100] lithium fluoride crystal was characterized under shock wave compression to 28GPa followed by complete stress release at the edges. The light was examined using time-gated optical spectrometry and imaging, time-resolved optical emission measurements, and hydrodynamic modeling. The shock arrival at the circumference of the crystal was delayed relative to the center so that the two regions could be studied at different times. The majority of the light emission originated when the shock waves released at the circumference of the crystal. Unlike previously reported results for shocked lithium fluoride, we found that the light spectrum is not strictly broad band, but has spectral lines associated with atomic lithium in addition to a broad band background. Also, the emission spectrum depends strongly on the gas surrounding the sample. Based on our observations, the line emission appears to be related to fracture of the lithium fluoride crystal from the shock wave releasing at the edges. Experimenters frequently utilize lithium fluoride crystals as transparent windows for observing shock compressed samples. Because of the experimental geometries used, the shock wave in such cases often reaches the circumference of the window at nearly the same moment as when it reaches themore » center of the sample-window interface. Light generated at the circumference could contaminate the measurement at the interface when this light scatters into the observed region. This background light may be reduced or avoided using experimental geometries which delay the arrival of the shock wave at the edges of the crystal.« less

Authors:
 [1];  [1];  [1];  [1];  [2];  [1];  [3]
+ Show Author Affiliations
  1. NSTec
  2. LANL
  3. NSTec, LANL
Publication Date:
Research Org.:
Nevada Test Site (NTS), Mercury, NV (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1136767
Report Number(s):
DOE/NV/25946-1663
Journal ID: ISSN 0021-8979
DOE Contract Number:  
DE-AC52-06NA25946
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 113; Journal Issue: 13; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
LiF, luminescence, lithium fluoride

Citation Formats

Turley, W. D., Stevens, G. D., Capelle, G. A., Grover, M., Holtkamp, D. B., LaLone, B. M., and Veeser, L. R. Luminescence from Edge Fracture in Shocked Lithium Fluoride Crystals. United States: N. p., 2013. Web. doi:10.1063/1.4798576.
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Turley, W. D., Stevens, G. D., Capelle, G. A., Grover, M., Holtkamp, D. B., LaLone, B. M., & Veeser, L. R. Luminescence from Edge Fracture in Shocked Lithium Fluoride Crystals. United States. https://doi.org/10.1063/1.4798576
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Turley, W. D., Stevens, G. D., Capelle, G. A., Grover, M., Holtkamp, D. B., LaLone, B. M., and Veeser, L. R. Tue . "Luminescence from Edge Fracture in Shocked Lithium Fluoride Crystals". United States. https://doi.org/10.1063/1.4798576.
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@article{osti_1136767,
title = {Luminescence from Edge Fracture in Shocked Lithium Fluoride Crystals},
author = {Turley, W. D. and Stevens, G. D. and Capelle, G. A. and Grover, M. and Holtkamp, D. B. and LaLone, B. M. and Veeser, L. R.},
abstractNote = {Light emitted from a [100] lithium fluoride crystal was characterized under shock wave compression to 28GPa followed by complete stress release at the edges. The light was examined using time-gated optical spectrometry and imaging, time-resolved optical emission measurements, and hydrodynamic modeling. The shock arrival at the circumference of the crystal was delayed relative to the center so that the two regions could be studied at different times. The majority of the light emission originated when the shock waves released at the circumference of the crystal. Unlike previously reported results for shocked lithium fluoride, we found that the light spectrum is not strictly broad band, but has spectral lines associated with atomic lithium in addition to a broad band background. Also, the emission spectrum depends strongly on the gas surrounding the sample. Based on our observations, the line emission appears to be related to fracture of the lithium fluoride crystal from the shock wave releasing at the edges. Experimenters frequently utilize lithium fluoride crystals as transparent windows for observing shock compressed samples. Because of the experimental geometries used, the shock wave in such cases often reaches the circumference of the window at nearly the same moment as when it reaches the center of the sample-window interface. Light generated at the circumference could contaminate the measurement at the interface when this light scatters into the observed region. This background light may be reduced or avoided using experimental geometries which delay the arrival of the shock wave at the edges of the crystal.},
doi = {10.1063/1.4798576},
url = {https://www.osti.gov/biblio/1136767}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 13,
volume = 113,
place = {United States},
year = {2013},
month = {1}
}
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Journal Article:
https://doi.org/10.1063/1.4798576
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Works referenced in this record:

Shock‐Wave Studies of PMMA, Fused Silica, and Sapphire
journal, September 1970

Shock-wave-induced optical emission from sapphire in the stress range 12 to 45 GPa: Images and spectra
journal, July 2002

Investigation of shock-induced light from sapphire for use in pyrometry studies
journal, July 2005

Shock deformation of brittle solids
journal, January 1980

An investigation of shock induced temperature rise and melting of bismuth using high-speed optical pyrometry
journal, April 2002

Measurement of the shock-heated melt curve of lead using pyrometry and reflectometry
journal, February 2005

Compact system for high-speed velocimetry using heterodyne techniques
journal, August 2006

Unsteady compression waves in interferometer windows
journal, June 2001

CTH: A three-dimensional shock wave physics code
journal, January 1990

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