Raman Spectroscopy of Hot Dense Hydrogen

Eugene Gregoryanz, Alexander F. Goncharov, Kiyoto Matsuishi, Ho-kwang Mao, Russell J. Hemley
2003 Physical Review Letters  
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 d=dT P increases by a factor of 30
more » ... by a factor of 30 over the measured pressure range, indicating an increase in intrinsic anharmonicity and weakening of the molecular bond.
doi:10.1103/physrevlett.90.175701 pmid:12786081 fatcat:ulkfhmfw2jgoxcfxetc3evekae