A Laser Analyzer of the Kinetics of Interaction of Water Molecules with an Adsorbent

摘要

A device for recording high-speed processes of water-vapor sorption at the surfaces of porous materials is described. The water-vapor pressure over a sample is measured during the sorption process by registering the integral intensity of the absorption line of H_2O molecules at a wavelength of 1.85 μm. The kinetic curves of changes in the partial pressure (concentration of H_2O molecules) from 1 mTorr to 20 Torr are recorded in a time range from 1 ms to 24 h with an accuracy better than 1% at buffer-gas concentrations of 0-760 Torr. The obtained data are used to determine the sorption and structural parameters of investigated materials.