Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 108, Issue 15, Pages 6014-6019Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1102760108
Keywords
diamond anvil cell; high pressure; Raman scattering; laser heating; melting
Categories
Funding
- Department of Energy National Nuclear Security Adminstration (Carnegie/DOE Alliance Center) [DE-FC52-08NA28554]
- National Science Foundation Division of Materials Research [DMR-0805056]
- US Army Research Office
- National Aeronautics and Space Administration Astrobiology Institute
- Department of Energy Office of Basic Energy Sciences Energy Frontier Research Center at the Carnegie Institution of Washington (EFree)
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [805056] Funding Source: National Science Foundation
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Raman spectroscopy in laser-heated diamond anvil cells has been employed to probe the bonding state and phase diagram of dense hydrogen up to 140 GPa and 1,500 K. The measurements were made possible as a result of the development of new techniques for containing and probing the hot, dense fluid, which is of fundamental importance in physics, planetary science, and astrophysics. A pronounced discontinuous softening of the molecular vibron was found at elevated temperatures along with a large broadening and decrease in intensity of the roton bands. These phenomena indicate the existence of a state of the fluid having significantly modified intramolecular bonding. The results are consistent with the existence of a pressure-induced transformation in the fluid related to the presence of a temperature maximum in the melting line as a function of pressure.
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