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Summary: Shock-compressed MgSiO3 glass, enstatite, olivine, and quartz:
Optical emission, temperatures, and melting
Sheng-Nian Luo
Plasma Physics (P-24) and Earth and Environmental Sciences (EES-11), Los Alamos National Laboratory, Los Alamos,
New Mexico, USA
Lindhurst Laboratory of Experimental Geophysics, Seismological Laboratory, California Institute of Technology, Pasadena,
California, USA
Joseph A. Akins and Thomas J. Ahrens
Lindhurst Laboratory of Experimental Geophysics, Seismological Laboratory, California Institute of Technology, Pasadena,
California, USA
Paul D. Asimow
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, USA
Received 20 October 2003; revised 3 March 2004; accepted 10 March 2004; published 11 May 2004.
[1] Optical emission of MgSiO3 glass, enstatite, olivine, and quartz under shock wave
compression was investigated with optical pyrometry at discrete wavelengths ranging
from visible to near infrared. We develop a new analysis of optical emission that does not
require a gray body assumption. Instead, at each wavelength, the optical linear absorption
coefficients (a) and blackbody spectral radiances (Llb) of shocked and unshocked
materials were obtained by nonlinear fitting to the time-resolved radiance from the target
assembly. The absorption spectra of unshocked samples corresponding to the measured
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