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Crystal structure and density of helium to 232 kbarThe properties of helium and hydrogen at high pressure are topics of great interest to the understanding of planetary interiors. These materials constitute 95 percent of the entire solar system. A technique was presented for the measurement of X-ray diffraction from single-crystals of low-Z condenses gases in a diamond-anvil cell at high pressure. The first such single-crystal X-ray diffraction measurements on solid hydrogen to 26.5 GPa were presented. The application of this technique to the problem of the crystal structure, equation of state, and phase diagram of solid helium is reported. Crucial for X-ray diffraction studies of these materials is the use of a synchrotron radiation source which provides high brillance, narrow collimation of the incident and diffracted X-ray beams to reduce the background noise, and energy-dispersive diffraction techniques with polychromatic (white) radiation, which provides high detection efficiency.
Document ID
19880021097
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Mao, H. K.
(Carnegie Institution of Washington DC., United States)
Wu, Y.
(Carnegie Institution of Washington DC., United States)
Jephcoat, A. P.
(Carnegie Institution of Washington DC., United States)
Hemley, R. J.
(Carnegie Institution of Washington DC., United States)
Bell, P. M.
(Carnegie Institution of Washington DC., United States)
Bassett, W. A.
(Cornell Univ. Ithaca, N.Y., United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1988
Publication Information
Publication: Lunar and Planetary Inst., Nineteenth Lunar and Planetary Science Conference. Press abstracts
Subject Category
Lunar And Planetary Exploration
Accession Number
88N30481
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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