Time-resolved optical spectroscopy measurements of shocked liquid deuterium

作者: J. E. Bailey , M. D. Knudson , A. L. Carlson , G. S. Dunham , M. P. Desjarlais

DOI: 10.1103/PHYSREVB.78.144107

关键词: PhysicsShock (mechanics)SpectroscopyEquation of state (cosmology)WavelengthEmissivityDeuteriumTemperature measurementAtomic physicsOpticsSpectral line

摘要: Time-resolved optical spectroscopy has been used to measure the shock pressure steadiness, emissivity, and temperature of liquid deuterium shocked 22--90 GPa. The was produced using magnetically accelerated flyer plate impact, spectra were acquired with a suite four fiber-optic-coupled spectrometers streak camera detectors. changes by an average $\ensuremath{-}1.2%$ over 10--30 ns cell transit time, determined from relative in front self-emission time. reflectivity measured $5140\text{ }\text{\AA{}}$ $5320\text{ laser light reflected ${D}_{2}$ shock. emissivity inferred measurements reasonably good agreement quantum molecular dynamics simulation predictions. spectral radiance wavelength dependence found agree well (average normalized ${\ensuremath{\chi}}^{2}=1.6$) Planckian multiplied emissivity. wavelength-dependent self-emission. Thirty-seven spanning GPa range accumulated. large number enables comparison scatter data expectations for Gaussian distribution. This facilitates determination uncertainties that incorporate both apparatus contributions otherwise unquantified systematic effects cause variations one experiment another. Agreement between temperatures absolute shape spectrum further substantiates absence biases. weighted mean as low $\ifmmode\pm\else\textpm\fi{}3--4%$, enabling discrimination competing models equation state (EOS). results predict maximum compression $\ensuremath{\sim}4.4$. Softer approximately sixfold are inconsistent very high statistical confidence level. Previous analysis [D. Saumon T. Guillot, Astrophys. J. 609, 1170 (2004)] Jupiter's internal structure shown core mass is restricted be less than three times Earth, if EOS consistent these employed.

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