Optical Properties of Fluid Hydrogen at the Transition to a Conducting State

We use fast transient transmission and emission spectroscopies in the pulse laser heated diamond anvil cell to probe the energy-dependent optical properties of hydrogen at pressures of 10-150 GPa and temperatures up to 6000 K. Hydrogen is absorptive at visible to near-infrared wavelengths above a th...

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Bibliographic Details
Published in:Physical review letters 2016-06, Vol.116 (25), p.255501-255501, Article 255501
Main Authors: McWilliams, R Stewart, Dalton, D Allen, Mahmood, Mohammad F, Goncharov, Alexander F
Format: Article
Language:English
Subjects:
Absorptivity
Diamond anvil cells
Hydrogen storage
Laser beam heating
Near infrared radiation
Optical properties
Spectra
Wavelengths
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Summary:We use fast transient transmission and emission spectroscopies in the pulse laser heated diamond anvil cell to probe the energy-dependent optical properties of hydrogen at pressures of 10-150 GPa and temperatures up to 6000 K. Hydrogen is absorptive at visible to near-infrared wavelengths above a threshold temperature that decreases from 3000 K at 18 GPa to 1700 K at 110 GPa. Transmission spectra at 2400 K and 141 GPa indicate that the absorptive hydrogen is semiconducting or semimetallic in character, definitively ruling out a first-order insulator-metal transition in the studied pressure range.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.116.255501