LAUSR

The in situ high pressure Raman spectrum of CD4 was found to be subtly different from its’ hydrogenous analog, CH4. High quality data were obtained for the first time for pressures between 12 and 20 GPa during both fast and slow compression. Similarly to CH4 in phase B, CD4 does exhibit peak splitting in the ν1 (symmetric stretch) and ν3 (antisymmetric stretch) modes, but having the emergent shoulders present on the high-frequency side of the peaks rather than the low-frequency one as in the case of CH4. The general aspect of the Raman spectrum was found to be very different from that of CH4, with modes ν1 and ν3 having comparable intensities and the latter being sharper and better defined, in stark contrast to how it appears in CH4.The in situ high pressure Raman spectrum of CD4 was found to be subtly different from its’ hydrogenous analog, CH4. High quality data were obtained for the first time for pressures between 12 and 20 GPa during both fast and slow compression. Similarly to CH4 in phase B, CD4 does exhibit peak splitting in the ν1 (symmetric stretch) and ν3 (antisymmetric stretch) modes, but having the emergent shoulders present on the high-frequency side of the peaks rather than the low-frequency one as in the case of CH4. The general aspect of the Raman spectrum was found to be very different from that of CH4, with modes ν1 and ν3 having comparable intensities and the latter being sharper and better defined, in stark contrast to how it appears in CH4.