In-Situ High Pressure And High Temperature Raman And Brillouin Scattering Research For A Laser Heated Diamond Anvil Cell System

In-situ high pressure and high temperature (HPHT) Raman spectroscopy plays an important role for understanding not only the fundamental physical properties of condensed matter, but also the physical and chemical processes in the Earth's dynamic interior. Detailed information on the variety of phonon spectra, electron-phonon interaction and the anharmonic effect on lattice vibration at pressure and temperature could be obtained from the Raman spectra recorded under HPHT condition. Furthermore, measurements and estimates of the melting curve and the Mode-Grüneisen parameter, an important thermodynamic property of the material that relates the thermal pressure and the thermal energy, are crucial for studies of the solid-solid, solid-liquid phase transitions and P-T phase diagram.The knowledge of the elastic properties of materials at elevated pressure and temperature (P-T) conditions is important for variety of geophysical and planetary purposes. Compared with seismic data, the elastic moduli can be used to infer the structure and chemical composition of the Earth's interior. The observed seismic anisotropy of the Earth could also be understood by studying the effects of pressure and temperature on the minerals. From the planetary science point of view, the surface of Uranus and Neptune are buried by a thick intermediate layer...