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High-pressure in situ Brillouin spectroscopy in a diamond-anvil cell

Recent developments in high-pressure in situ Brillouin spectroscopy are reviewed by showing experimental and analytical methods for the study of acoustic velocities in any direction, adiabatic elastic constants, and the Cauchy violation under high pressures. Detailed application to solid argon is presented, and its experimental results are compared with the most recent theoretical calculations up to 80 GPa. The first Brillouin measurements of liquid and solid neon are shown and compared with those of heavier rare-gas solids argon and krypton.