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- W2020106382 abstract "Rotational and lattice phonon excitations in the Raman spectrum of solid molecular deuterium have been measured from 1.8 GPa to ensuremath{sim}200 GPa at 77-295 K to study pressure-induced changes in structural and dynamical properties of the dense solid. Continuous and discontinuous changes in three distinct pressure ranges are observed. At lower pressures (30 GPa), there is a gradual increase in the linewidth of the ${mathit{S}}_{0}$(0) band, together with gradually decreasing resolution of the higher-energy ${mathit{S}}_{0}$(1) and ${mathit{S}}_{0}$(2) features. At intermediate pressures (60--100 GPa), a change in the pressure dependence and linewidth of ${mathit{S}}_{0}$(0), and a linewidth and intensity decrease in the ${mathit{E}}_{2mathit{g}}$ phonon band occur. This is interpreted as evidence for a phase transformation in the molecular solid beginning at ensuremath{sim}65 GPa (77 K). At the highest pressures (ensuremath{sim}160 GPa), abrupt changes in the low-frequency excitations suggest either an expansion of the molecular bond or a change in ordering at the vibron discontinuity. Evidence from the low-frequency spectra for interaction between the deuterium sample and diamond anvil is also examined." @default.
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- W2020106382 date "1993-09-01" @default.
- W2020106382 modified "2023-10-03" @default.
- W2020106382 title "Low-frequency Raman spectroscopy of deuterium to megabar pressures at 77-295 K" @default.
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- W2020106382 doi "https://doi.org/10.1103/physrevb.48.5779" @default.
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