Intermolecular coupling and fluxional behavior of hydrogen in phase IV
arXiv:1908.05703 · doi:10.1073/pnas.1916385116
Abstract
We performed Raman and infrared (IR) spectroscopy measurements of hydrogen at 295 K up to 280 GPa at an IR synchrotron facility of SSRF. To reach the highest pressure, hydrogen was loaded into toroidal diamond anvils with 40 micrometers central culet. The intermolecular coupling has been determined by concomitant measurements of the IR and Raman vibron modes. In phase IV, we find that the intermolecular coupling is much stronger in the graphene (G) like layer of elongated molecules compared to the Br2 like layer of shortened molecules and it increases with pressure much faster in the G layer compared to the Br2 layer. These heterogeneous lattice dynamical properties are unique features of highly fluxional hydrogen phase IV.
arXiv commentMain text: 8 pages, 4 figures SI: 4 pages, 3 figures
References in corpus (11)
- A superconductor to superfluid phase transition in liquid metallic hydrogen
- A quantum fluid of metallic hydrogen suggested by first-principles calculations
- Density functional theory study of phase IV of solid hydrogen
- Quantum and Classical Orientational Ordering in Solid Hydrogen
- Quantum Monte Carlo study of the phase diagram of solid molecular hydrogen at extreme pressures
- Proton Transfer in Phase IV of Solid Hydrogen and Deuterium
- Room-Temperature Structures of Solid Hydrogen at High Pressures
- Bonding, structures, and band gap closure of hydrogen at high pressures
- Observability of a projected new state of matter: a metallic superfluid
- Strong Isotopic Effect in Phase II of Dense Solid Hydrogen and Deuterium
- Public Debate on Metallic Hydrogen to Boost High Pressure Research