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- W1493018843 abstract "We present a technique for extracting Raman intensities from ab initio molecular dynamics (MD) simulations at high temperature. The method is applied to the highly anharmonic case of dense hydrogen up to 500 K for pressures ranging from 180 GPa to 300 GPa. On heating or pressurizing we find first-order phase transitions at the experimental conditions of the phase III - IV boundary. Direct comparison of Raman vibrons with experiment provides excellent discrimination between subtly different structures, found in MD. We find candidate structures whose Raman spectra are in good agreement with experiment. The new phase obtained in high temperature simulations adopts a dynamic, simple hexagonal structure with three layer types: freely rotating hydrogen molecules, static hexagonal trimers and rotating hexagonal trimers. We show that previously calculated structures for phase IV are inconsistent with experiment, and their appearance in simulation is due to finite size effects." @default.
- W1493018843 created "2016-06-24" @default.
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- W1493018843 date "2013-02-22" @default.
- W1493018843 modified "2023-09-27" @default.
- W1493018843 title "Simulating Raman Spectra using molecular dynamics, and identification of high-pressure phases III and IV in hydrogen" @default.
- W1493018843 hasPublicationYear "2013" @default.
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