Raman spectroscopy of hot dense hydrogen

E Gregoryanz, AF Goncharov, K Matsuishi, H Mao, RJ Hemley

Research output: Contribution to journalArticlepeer-review

Abstract

High P-T Raman measurements of solid and fluid hydrogen to above 1100 K at 70 GPa and to above 650 K in 150 GPa range, conditions previously inaccessible by static compression experiments, provide new insight into the behavior of the material under extreme conditions. The data give a direct measure of the melting curve that extends previous optical investigations by up to a factor of 4 in pressure. The magnitude of the vibron frequency temperature derivative (dnu/dT)(P) increases by a factor of similar to30 over the measured pressure range, indicating an increase in intrinsic anharmonicity and weakening of the molecular bond.

Original languageEnglish
Article number175701
Number of pages4
JournalPhysical Review Letters
Volume90
Issue number17
DOIs
Publication statusPublished - 2 May 2003

Keywords

  • X-RAY-DIFFRACTION
  • SOLID MOLECULAR-HYDROGEN
  • EQUATION-OF-STATE
  • GPA 1.4 MBAR
  • MEGABAR PRESSURES
  • ELECTRICAL-CONDUCTIVITY
  • LIQUID DEUTERIUM
  • PHASE-TRANSITION
  • MELTING CURVES
  • METALLIZATION

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