Null Pressure Optical Cell for Measurements on Liquids at Elevated Temperatures and Pressures

摘要

An optical cell used in obtaining absorption spectra at temperatures up to 500°C and pressures up to 2100 kg cm-2 is described. The cell can be characterized as a ``null‐pressure'' device. The solution is contained in a sealed quartz cuvette and the pressure exerted by the solution within the cell is balanced by an external pressure of argon gas. The near ir spectra of water below and above the critical temperature are presented.