Micro-optic system for reflectance measurements at pressures to 70 kilobar

An optical system which makes it possible to obtain reflectance spectra of solids in the range of hydrostatic pressures 0-70 kilobar and higher is described. The system is used in conjunction with a diamond anvil pressure cell, and has a spectral range of 0.6-4.5 eV. An example is furnished illustrating its use in an investigation of the shift with pressure of the plasma reflectance edge of TTF-TCNQ.