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Science 4 March 1988:
Vol. 239. no. 4844, pp. 1131 - 1134
DOI: 10.1126/science.239.4844.1131
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Articles

Synchrotron X-ray Diffraction Measurements of Single-Crystal Hydrogen to 26.5 Gigapascals

H. K. MAO 1, A. P. JEPHCOAT 1, R. J. HEMLEY 1, L. W. FINGER 1, C. S. ZHA 1, R. M. HAZEN 1, and D. E. COX 2

1 Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20008.
2 Department of Physics, Brookhaven National Laboratory, Upton, NY 11973.

The crystal structure and equation of state of solid hydrogen have been determined directly to 26.5 gigapascals at room temperature by new synchrotron x-ray diffraction techniques. Solid hydrogen remains in the hexagonal close-packed structure under these pressure-temperature conditions and exhibits increasing structural anisotropy with pressure. The pressure-volume curve determined from the x-ray data represents the most accurate experimental measurement of the equation of state to date in this pressure range. The results remove the discrepancy between earlier indirect determinations and provide a new experimental constraint on the molecular-to-atomic transition predicted at higher pressures.

Submitted on October 26, 1987
Accepted on January 20, 1988


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