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Synchrotron infrared spectroscopy at megabar pressures - Vibrational dynamics of hydrogen to 180 GPaNew techniques for measuring infrared spectra at megabar pressures using synchrotron radiation have been developed and applied to study the Q1(1), Qi(1) + Si(0), and QR(J) vibrational transitions of solid hydrogen to 180 GPa. The frequency difference between the Q1(1) infrared and Raman vibrons increases from 3/cm (zero pressure) to 510/cm (180 GPa), indicating a dramatic increase in intermolecular coupling with pressure. A negative frequency shift is observed for the infrared vibron above 140 GPa. A significant increase in frequency and LO-TO splitting of the lattice phonon is also documented.
Document ID
19920070001
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hanfland, M.
(NASA Headquarters Washington, DC United States)
Hemley, R. J.
(NASA Headquarters Washington, DC United States)
Mao, H. K.
(Carnegie Institution of Washington Washington, United States)
Williams, G. P.
(Brookhaven National Laboratory Upton, NY, United States)
Date Acquired
August 15, 2013
Publication Date
August 17, 1992
Publication Information
Publication: Physical Review Letters
Volume: 69
Issue: 7 Au
ISSN: 0031-9007
Subject Category
Inorganic And Physical Chemistry
Accession Number
92A52625
Funding Number(s)
CONTRACT_GRANT: NAGW-1722
CONTRACT_GRANT: NSF DMR-89-12226
CONTRACT_GRANT: DE-AC02-76CH-00016
Distribution Limits
Public
Copyright
Other

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