Synchrotron infrared spectroscopy at megabar pressures: Vibrational dynamics of hydrogen to 180 GPa
Journal Article
·
· Physical Review Letters; (United States)
- Geophysical Laboratory and Center for High-Pressure Research, Carnegie Institution of Washington, Washington, D.C. 20015 (United States) National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973 (United States)
We have developed new techniques for measuring infrared spectra at megabar pressures using synchrotron radiation and applied them to study the {ital Q}{sub 1}(1), {ital Q}{sub 1}(1)+{ital S}{sub 1}(0), and {ital Q}{sub {ital R}}({ital J}) vibrational transitions of solid hydrogen to 180 GPa. The frequency difference between the {ital Q}{sub 1}(1) infrared and Raman vibrons increases from 3 cm{sup {minus}1} (zero pressure) to 510 cm{sup {minus}1} (180 GPa), including 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.
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 7017794
- Journal Information:
- Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 69:7; ISSN PRLTA; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360606* -- Other Materials-- Physical Properties-- (1992-)
665100 -- Nuclear Techniques in Condensed Matter Physics -- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BREMSSTRAHLUNG
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY LEVELS
EXCITED STATES
HYDROGEN
INFRARED SPECTRA
INTERMOLECULAR FORCES
LASER SPECTROSCOPY
MEASURING METHODS
NONMETALS
RADIATIONS
RAMAN SPECTROSCOPY
RELAXATION
SOLIDS
SPECTRA
SPECTROSCOPY
SYNCHROTRON RADIATION
VERY HIGH PRESSURE
VIBRATIONAL STATES
360606* -- Other Materials-- Physical Properties-- (1992-)
665100 -- Nuclear Techniques in Condensed Matter Physics -- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BREMSSTRAHLUNG
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY LEVELS
EXCITED STATES
HYDROGEN
INFRARED SPECTRA
INTERMOLECULAR FORCES
LASER SPECTROSCOPY
MEASURING METHODS
NONMETALS
RADIATIONS
RAMAN SPECTROSCOPY
RELAXATION
SOLIDS
SPECTRA
SPECTROSCOPY
SYNCHROTRON RADIATION
VERY HIGH PRESSURE
VIBRATIONAL STATES