The study of the density dependence of neutron di raction spectra in dilute gases, already applied in recent papers to the determination of two- and three-body interaction properties in monatomic insulating ¯ uids, is extended here to the case of a molecular ¯ uid. Deuterated methane has been chosen for its good neutron scattering properties and its small molecular anisotropy. The centre-of-mass static structure factor S (Q ) has been measured at four densities between 0.55 nm- 3 and 1.84 nm- 3 and at a temperature just below critical. Density analysis of the Fourier transform c (Q ) of the direct correlation function makes it possible to show that valuable information on the intermolecular interactions is contained in the neutron data.
Neutron diffraction from low-density CD4 gas / E. Guarini; U. Bafile; F. Barocchi; F. Cilloco; R. Magli. - In: MOLECULAR PHYSICS. - ISSN 0026-8976. - STAMPA. - 94:(1998), pp. 289-295. [10.1080/002689798168169]
Neutron diffraction from low-density CD4 gas
GUARINI GRISALDI TAJA O DEL TAJA, ELEONORA;BAROCCHI, FABRIZIO;
1998
Abstract
The study of the density dependence of neutron di raction spectra in dilute gases, already applied in recent papers to the determination of two- and three-body interaction properties in monatomic insulating ¯ uids, is extended here to the case of a molecular ¯ uid. Deuterated methane has been chosen for its good neutron scattering properties and its small molecular anisotropy. The centre-of-mass static structure factor S (Q ) has been measured at four densities between 0.55 nm- 3 and 1.84 nm- 3 and at a temperature just below critical. Density analysis of the Fourier transform c (Q ) of the direct correlation function makes it possible to show that valuable information on the intermolecular interactions is contained in the neutron data.
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