Optical Spectroscopic Experiments under Quasi-hydrostatic Pressure of 126.5 GPa

A multifunctional spectroscopic system for high pressure experiments using diamond anvil cell has been established. It was used for optical absorption, reflectance, luminescence, and Raman scattering experiments, and a highest quasi-hydrostatic pressure of 126.5 GPa has been obtained for absorption experiment of ordinary liquid nitrogen. Authors represent a fact that gasketed diamond anvil cell with beveled anvils and gas pressure medium shows a pressure generating capability much higher than 126.5 GPa, and the challenging problem is inefficient ruby fluorescence method of pressure measurement under high pressure.