Results 161 to 170 of about 846,899 (201)

6 Coherent quasielastic neutron scattering

2000
Abstract QENS on diffusing atoms with a sizable coherent neutron scattering cross section yields information on interference effects and correlated motion contained in the coherent scattering function S(Q, ω). As an introduction to this complex situation, this chapter begins by describing first coherent elastic scattering due to short ...
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Quasielastic neutron scattering in copper halides

Physica B: Condensed Matter, 1997
Abstract Interest in the copper halides arises from their superionic or fast-ion conducting properties, i.e., the conductivity in the high-temperature solid is comparable to that in the melt. A further interest is that the changes are accompanied by structural phase changes.
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Quasielastic neutron scattering study of acidic solutions

Journal of Physics: Condensed Matter, 1990
The aim of the work is to characterize by quasielastic neutron scattering (QNS) not only the usual transport processes occurring in aqueous solution but also something specific to the high proton conductivity in acidic solutions. The addition of a strong acid such as H2SO4 or HNO3 to water provokes a marked slowing down of the mean translational ...
D Davagnat, J C Lassegues
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5 Incoherent quasielastic neutron scattering

2000
Abstract In the case of spatially limited jump diffusion, the incoherent scattering function consists of an elastic and a quasielastic part, and the fraction of elastic intensity is called the incoherent structure factor, EISF. This chapter evaluates different scenarios and the corresponding EISFs.
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Quasielastic neutron scattering facility at Dhruva reactor

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001
Quasi-elastic neutron scattering is a powerful experimental tool for studying the various dynamical motions in solids and liquids. In this paper, we have described the salient features of the quasi-elastic neutron spectrometer in operation at Dhruva reactor at Trombay, India.
R. Mukhopadhyay, S. Mitra, S.K. Paranjpe, B.A. Dasannacharya   +3 more
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Point-Defect Diffusion from Coherent Quasielastic Neutron Scattering

Physical Review Letters, 1985
We outline a theory which suggests that the dynamics of point defects in crystals can be studied by coherent quasielastic neutron scattering. The theory assumes that the surrounding lattice distortion follows each defect instantaneously, and that the distortion fields of different defects can be linearly superposed.
, Gillan, , Wolf
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Quasielastic neutron scattering and super-protonic conductors

Solid State Ionics, 1993
Abstract The present “state of art” of quasielastic incoherent neutron scattering (QINS) methods is reviewed, with special emphasis on the analysis of experiments concerning the diffusive motion of protons in solid-state protonic conductors. Models for uncorrelated and correlated diffusion, including local and long-range aspects of the motion are ...
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Molecular dynamics of glucose in solution: A quasielastic neutron scattering study

The Journal of Chemical Physics, 2004
The molecular dynamics of glucose dissolved in heavy water have been investigated at 280 K by the technique of quasielastic neutron scattering. The scattering was described by a dynamic structure factor that accounts for decoupled diffusive jumps and free rotational motions of the glucose molecules.
Luis J, Smith, David L, Price, Zema, Chowdhuri, John W, Brady, Marie-Louise, Saboungi   +4 more
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Quasielastic and inelastic neutron scattering from AgPO3AgI glass☆

Solid State Ionics, 1986
A quasielastic neutron scattering experiment was performed on the fast ionic conductor AgPO3-Agl, which is a vitreous electrolyte. This experiment was performed on the time-of-flight spectrometer IN 6 of the Institut Laue-Langevin in Grenoble, with the following parameters: λ=5.1 A; 1.25 A ...
M TACHEZ, R MERCIER, J MALUGANI, A DIANOUX   +3 more
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Polarization analysis techniques for quasielastic neutron scattering

Physica B: Condensed Matter, 1992
A description of quasielastic scattering and polarization analysis is followed by a discussion of the combination of both techniques, which can play an important role. It is shown how an optimized procedure would appear for various samples from very different fields of physics.
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