Figure 1

Pressure-induced Raman spectra of solid xenon at various pressures up to $41\mathrm{GPa}$. The $E_{2g}$ (TO) vibrational mode, which is Raman active in the hcp phase, appears at about $40{\mathrm{cm}}^{-1}$ and around $P=5\mathrm{GPa}$, and its Raman-band intensity increases with increasing pressure.Reuse & Permissions

Figure 2

The frequency of transverse optic $E_{2g}$ mode as a function of pressure up to $41\mathrm{GPa}$ in the hcp phase. Open circles and solid triangles show the present experimental and first-principles calculations, respectively. The inset shows the volume dependence of experimental and theoretical Raman frequencies.Reuse & Permissions

Figure 3

Pressure dependences of the integrated Raman-band intensities are shown by open circles and open triangles, and a thick solid curve shows the experimental tendency in spite of a jumped point of Raman intensity at about $25\mathrm{GPa}$. First-principles calculations are presented by open squares and shown by a thin solid line. For comparison, x-ray data of the relative proportions of fcc and hcp phases (Ref. 7) are shown by solid circles and solid triangles as a function of pressure, where broken lines also serve as a guide for the eye. The x-ray saturated level at high pressure is set to $I_h∕(I_h+I_f)=R=1$, where $I_f$ and $I_h$ are the integrated intensities of the fcc (200) and hcp (100) reflection peaks, respectively. Here, experimental and theoretical Raman intensities are scaled by arbitrary units, but their saturated points at highest pressure are set nearby the x-ray saturated $R=1$ for convenience.Reuse & Permissions