Infra-red absorption of HDO in water at high pressures and temperatures

Abstract

By use of a specially designed cell with a sapphire window the absorption of the OD-stretching vibration of HDO in H20 has been measured at frequencies from 2200 to 2900 cm-1 and at temperatures and pressures from 30 to 400°C and from 50 to 4000 bars respectively. At the supercritical temperature of 400°C and pressures below 200 bars (corresponding to a density of water of 0.1 g/cm3) the rotational structure of the vibration band of free water molecules is observed. At higher density only one intensive absorption maximum with simple shape is observed at all temperatures. This is considered as support for the continuum model for water in the liquid and in the dense supercritical state.

Near Infrared Spectra of Water in Aqueous Solutions of Organic Salts. A Solvation Study of Bu4NBr, , and

“…We report here a simple differential analysis of the near-infrared spectra of aqueous solutions, which provides a sensitive method for comparing the effect of temperature to that of hydrophobic solutes on the solvent spectrum. Near-infrared spectroscopy has often been employed as a means of studying solvent modifications in aqueous solutions (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13). 'NRCC Postdoctorate Fellow, 1969-1971 Discussion of the methods can be found in several recent papers and review articles (14,15).…”

Infrared Absorption of Concentrated Aqueous LiCl Solutions to High Pressures and Temperatures

“…Two isotherms for 200 °C and 300 °C of B as a function of the overall solution density Q in gem -1 are shown. The diagram includes values for pure water obtained and published previously [7,19]. The agreement between the old and new data is good.…”

“…As the mirror is surrounded by the pressurized material on all sides, the optical path length is independent of pressure, if the bending of the sapphire window is neglected. This experimental technique which was introduced by Hare and Welsh [10] and improved by Franck and Roth [7] reduces the essential difficulty of quantitative absorption spectroscopy at high pressures and temperatures which relates to the problem of precisely knowing the optical path length.…”

Infrarotabsorption von reinem Dichlormethan bis zu hohen Drücken und Temperaturen / Infrared Absorption of Pure Dichloromethane Measured up to High Pressures and Temperatures

“…Dabei bewähren sich infrarotspektroskopische Messungen, aus denen sich Aussagen über intermolekulare Wechselwirkungen ergeben. Bislang wurden vorwiegend die O-H, N-H und Cl-H Streckschwingungen in einfachen polaren Substanzen, wie Wasser [1], Ammoniak [2], und Chlorwasserstoff [3] untersucht. Es erschien nun interessant, Messungen auch an Molekülen mit C-H Bindungen durchzuführen.…”