Orientational phase transitions in hydrogen at megabar pressures
- 16 April 1990
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 64 (16) , 1939-1942
- https://doi.org/10.1103/physrevlett.64.1939
Abstract
We have studied solid molecular hydrogen in various ortho-para concentrations at megabar pressures and down to liquid-helium temperatures. From changes of Raman spectra of rotational and vibrational modes we have identified three new phases. We show evidence for the orientationally ordered phase of parahydrogen at a pressure of 110 GPa (1.1 Mbar) and 8 K and for molecular orientational ordering within the newly discovered hydrogen-A phase.Keywords
This publication has 15 references indexed in Scilit:
- Evidence for a structural phase transition in solid hydrogen at megabar pressuresPhysical Review Letters, 1989
- Isotope effects in dense solid hydrogen: Phase transition in deuterium at 190±20 GPaPhysical Review Letters, 1989
- Phase Transition in Solid Molecular Hydrogen at Ultrahigh PressuresPhysical Review Letters, 1988
- Ground state of solid hydrogen at high pressuresPhysical Review B, 1987
- New Low-Temperature Phase of Molecular Deuterium at Ultrahigh PressurePhysical Review Letters, 1981
- Roton softening in the solid hydrogensPhysics Letters A, 1981
- The solid molecular hydrogens in the condensed phase: Fundamentals and static propertiesReviews of Modern Physics, 1980
- Raman scattering in oriented crystals of paradeuterium and orthohydrogenPhysical Review B, 1975
- Molecular Ordering in Solid Hydrogen and Nitrogen in the Molecular-Field ApproximationPhysical Review B, 1973
- HIGH RESOLUTION RAMAN SPECTROSCOPY OF GASES: IX. SPECTRA OF H2, HD, AND D2Canadian Journal of Physics, 1957