An infrared study of water vapour in the temperature range 573–723 K. Dimerization enthalpy and absorption intensities for monomer and dimer

Publisher Website
Google Scholar
Abstract
A high-temperature high pressure cell with changeable path length was used to obtain the integrated intensities of the low density vapour in the spectral region λ = 2·7 μm along four isotherms in the range from 573 to 723 K. A linear dependence of the intensity was observed and interpreted in terms of the ‘monomer-dimer’ equilibrium. A dimerization enthalpy of 16·65 ± 3·77 kJ mol-1 has been found using the Arrhenius behaviour of the intensity isotherms. All isotherms intersect at zero pressure giving the total integrated intensity 54·92 ± 0·5 km mol-1. Rough estimation of the total intensity for the water dimer gives 318 ± 120 km mol-1.

This publication has 26 references indexed in Scilit: