Results 171 to 180 of about 28,456 (214)
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Future directions in quasi-elastic neutron scattering
Physica B: Condensed Matter, 1992Several experiments are described which highlight the most important parameters that have to be kept under control to ensure a successful outcome. Subsequently, some instruments are presented which still have to be developed but of which the concepts have already been proved.
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New opportunities in quasi elastic neutron scattering spectroscopy
Physica B: Condensed Matter, 2001The high energy resolution usually required in quasi elastic neutron scattering (QENS) spectroscopy is commonly achieved by the use of cold neutrons. This is one of the important research areas where the majority of current work is done on instruments on continuous reactor sources.
F Mezei, M Russina
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Quasi-elastic and inelastic 10 Å neutron scattering by nematic MBBA
Il Nuovo Cimento B, 1978The quasi-elastic and inelastic spectra of 10 a neutrons scattered by MBBA in its nematic phase at various angles are reported. For small energy transfers the measured spectra have been resolved in the quasi-elastic peak, whose broadening as a function of the momentum transfer allows an evaluation of the self-diffusion coefficient, and in a broader ...
DEMICHELIS F +2 more
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Quasi-elastic neutron scattering by an aqueous dispersion of nanodiamonds
Physics of the Solid State, 2014The relative fraction of water molecules involved in the hydration sphere of carbon nanoparticles is determined using the direct subtraction method from our previous data on neutron scattering by an aqueous dispersion of nanodiamonds.
N. M. Blagoveshchenskii +2 more
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Quasi-Elastic and Inelastic Neutron Scattering
1988The method of quasi-elastic and inelastic neutron scattering is outlined and its usefulness for studying molecular motions in condensed matter is stressed. After a short introduction to the theory of neutron scattering, some details are given on quasi-elastic scattering and its application to the study of various non-periodic motions.
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Experimental study of quasi-elastic scattering of ultracold neutrons
The European Physical Journal B - Condensed Matter, 2002Ultracold neutrons (UCN) are lost from traps if they are quasi-elastically scattered from the wall with an energy gain sufficient to exceed the Fermi potential for the wall. Possible mechanisms of a quasi-elastic energy transfer are, for instance, scattering from hydrogen diffusing in an impurity surface layer or on surface waves at a liquid wall ...
A. Steyerl +9 more
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A Practical Guide to Quasi-elastic Neutron Scattering
2020The technique of Quasi-Elastic Neutron Scattering (QENS) is a powerful experimental tool for extracting temporal and spatial information at the nanoscale from both soft and hard condensed matter systems. However, while seemingly simple, the method is beset with sensitivities that, if ill considered, can hinder data interpretation and possibly ...
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Quasi-elastic neutron scattering from polysaccharide gels
Physica B: Condensed Matter, 1989Abstract Quasi-elastic scattering from agarose-water gels was measured using the new pulsed-source spectrometer IRIS. Correlation times characterising the water dynamics at temperatures between -20 and 55°C were determined and show two distinct regions.
H.D. Middendorf +3 more
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Neutron transmission and quasi‐elastic neutron scattering in polymer hydrogels
Polymer Engineering & Science, 1999AbstractInvestigations of hydrogels with high water contents have recently acquired special significance. Hydrogels are crosslinked three‐dimensional networks of water‐soluble macromolecules saturated by water or water solutions of different substances. The interest in examination the fundamental physical properties for such systems is related to their
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On the quasi-elastic magnetic scattering of slow neutrons
Physica, 1963Synopsis It is shown that the imaginary part of the spin correlation function can be interpreted as the function which describes the propagation of a disturbance in the magnetization. This is a generalization of Van Hove's work for a gas or liquid.
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