Strukturuntersuchung konzentrierter wäßriger Caesiumhydroxid‐Lösungen mit Röntgen‐ und Neutronenstreuung

Abstract

Abstract X‐ray and neutron diffraction measurements each on three differently concentrated aqueous solutions of Cesiumhydroxid are reported. After the correction for background, self‐absorption, multiple scattering, inelastic effects and in case of X‐rays for the wavelength distribution of the incident beam the structure of the water molecule was deduced from the coherent neutron scattering cross section. The Cs + –Cs + –and Cs + –H 2 O/OH − pair correlation functions could be determined from these three X‐ray measurements. A quantitative analysis was performed by use of a geometrical model, which reproduces very well all measurements as well as the individual atom pair correlation functions. It turns out that the local order in aqueous CsOH‐solutions is very similar to the structure of solid CsOH · H 2 O. The Cs + ‐ions are located between layers consisting of slightly puckered hexagon rings of H 2 O and OH − , which are connected by H‐bonds.