The intra‐ and intermolecular structure of liquid dimethylsulfoxide (DMSO) was investigated by X‐ray and neutron diffraction. The weighted sums of the atom pair correlation functions were evaluated by Fourier transformation of the total corrected intensities obtained by applying the usual data reduction procedures on the measured intensities. Subsequently the intramolecular structures were determined and the intermolecular contributions were separated from the total intensities. The X‐ray scattering data obtained from a concentrate KI‐DMSO mixture (mole fraction K+ = 0.1231, mole fraction DMSO = 0.7538) were evaluated in the same manner. In case of pure DMSO X‐ray and neutron data were combined to eliminate single atom pair correlation functions in order to assign distances to atom pairs. Additionally structural models of the local order in the liquids were deduced and refined by least square fits of the intermolecular reduced intensities. It turned out that the local order of pure liquid DMSO is similar to the crystal structure. The KI‐DMSO mixture consists of solvent separated ion pairs according to our calculations.

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Liquid bromobenzene (C6H5Br) has been studied with differential anomalous scattering to determine the differential structure factor of the Br atoms. The experiments were carried out at beam line W1 at the Hamburger Synchrotronlaboratorium (HASYLAB). The differential structure factor was checked by comparison with the theoretical intramolecular structure factor calculated from well-known data of the intramolecular geometry of C6H5Br. The differential radial distribution function shows a peak at 3.9 Å, which can be assigned to Br–Br atom pairs.

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