Abstract
Abstract The “inelasticity correction” (IC) due to deviations from the static approximation in structure measurements using neutrons for liquid aluminium at 1000 K and liquid copper at 1393 K has been calculated. The dynamical scattering function S(Q, ω) has been approximated by the viscoelastic model and by the result of MD-calculations. Incoming neutron wavelengths ranging from 0.7 up to 2.4 A have been investigated. The results are compared with the usual Placzek correction in the form as derived by Yarnell et al. In analogy to the ideal gas model and the model of Ascarelli and Caglioti (AC) approximate ways of allowing for recoil and detailed balance when calculating the correction using a classical model of S(Q, ω) are proposed. It is shown that AC can be useful to obtain a first estimate of IC in cases where no models of S(Q, ω) are available. As a demonstration IC has been calculated for liquid rubidium and krypton gas at several densities.
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