Setup for precision optical studies of supercritical fluids in a wide temperature range at high pressures up to 1 GPa.

A setup with a working volume of more than 10 mm3 has been fabricated to experimentally study the optical properties of gases, liquids, and solutions in a wide range of temperature (from 200 to 500 K) at hydrostatic pressures up to 1 GPa. The experimental parameters can be maintained with an accuracy of 0.1 K and 1.5 MPa for up to 3-4 h. To introduce laser radiation and to record spectra, high-temperature optical fibers of increased strength in a metal sheath are introduced directly into the working chamber. The primary goal of experiments is to study the Raman radiation at vibron frequencies in supercritical fluids of molecular substances (N2, CO2, CH4, etc.).