scholarly journals J-NSE: Neutron spin echo spectrometer

2015 ◽  
Vol 1 ◽  
Author(s):  
Olaf Holderer ◽  
Oxana Ivanova
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Spin Echo ◽  
Inelastic Neutron ◽  
Neutron Spin ◽  
Time Range ◽  
Push Button ◽  
Near Surface ◽  
Neutron Spin Echo ◽  
Scattering Technique

Neutron Spin-Echo (NSE) spectroscopy is well known as the only neutron scattering technique that achieves energy resolution of several neV. By using the spin precession of polarized neutrons in magnetic field one can measure tiny velocity changes of the individual neutron during the scattering process. Contrary to other inelastic neutron scattering techniques, NSE measures the intermediate scattering function S(Q,t) in reciprocal space and time directly. The Neutron Spin-Echo spectrometer J-NSE, operated by JCNS, Forschungszentrum Jülich at the Heinz Maier-Leibnitz Zentrum (MLZ) in Garching, covers a time range (2 ps to 200 ns) on length scales accessible by small angle scattering technique. Along with conventional NSE spectroscopy that allows bulk measurements in transmission mode, J-NSE offers a new possibility - gracing incidence spin echo spectroscopy (GINSENS), developed to be used as "push-button" option in order to resolve the depth dependent near surface dynamics.

STUDY OF SLOW DYNAMICAL PROCESSES BY NEUTRON-SPIN-ECHO

1993 ◽  
Vol 07 (16n17) ◽  
pp. 2885-2907 ◽  
Author(s):  
FERENC MEZEI
Keyword(s):  
Time Scale ◽  
Soft Matter ◽  
Inelastic Neutron Scattering ◽  
Spin Echo ◽  
Slow Motion ◽  
Inelastic Neutron ◽  
Neutron Spin ◽  
Neutron Spin Echo ◽  
Relaxation Effects ◽  
Atomic Vibrations

Conventional resolution inelastic neutron scattering spectroscopy allows us to explore the behaviour of condensed matter essentially on the time scale of thermal atomic vibrations. By the application of the Neutron Spin Echo trick, which enables us to get around the Liouville theorem limitation of conventional methods, the resolution can be improved very substantially. This opened up the field for the study of a large variety of slow motion phenomena (critical slowing down, relaxation effects, disordered dynamics, soft matter), i.e. the investigation of processes on a mesoscopic time scale between microscopic collision times and macroscopic dynamics.

scholarly journals Understanding near-surface polymer dynamics by a combination of grazing-incidence neutron scattering and virtual experiments

2021 ◽  
Vol 54 (1) ◽  
Author(s):  
Tetyana Kyrey ◽  
Marina Ganeva ◽  
Judith Witte ◽  
Regine von Klitzing ◽  
Stefan Wellert ◽  
...  
Keyword(s):  
Data Analysis ◽  
Spin Echo ◽  
Grazing Incidence ◽  
Incidence Geometry ◽  
Polymer Dynamics ◽  
Neutron Spin ◽  
Time Range ◽  
Near Surface ◽  
Virtual Experiments ◽  
Neutron Spin Echo

Neutron spin-echo spectroscopy is a unique experimental method for the investigation of polymer dynamics. The combination of neutron spin-echo spectroscopy with grazing-incidence geometry (GINSES) opens the possibility to probe the dynamics of soft-matter materials in the vicinity of the solid substrate in the time range up to 100 ns. However, the usage of the GINSES technique has some peculiarities and, due to the novelty of the method and complexity of the scattering geometry, difficulties in further data analysis occur. The current work discusses how virtual experiments within the distorted-wave Born approximation using the BornAgain software can improve GINSES data treatment and aid the understanding of polymer dynamics in the vicinity of the solid surface. With two examples, poly(N-isopropyl acrylamide) brushes and poly(ethylene glycol) microgels on Si surfaces, the simulation as well as the application of the simulation to the GINSES data analysis are presented. The approach allowed a deeper insight to be gained of the background effect and scattering contribution of different layers.

scholarly journals Modeling the dynamics of phospholipids in the fluid phase of liposomes

Soft Matter ◽  
2020 ◽  
Vol 16 (13) ◽  
pp. 3245-3256 ◽  
Author(s):  
Sudipta Gupta ◽  
Gerald J. Schneider
Keyword(s):  
Neutron Scattering ◽  
Spin Echo ◽  
Fluid Phase ◽  
Scattering Data ◽  
Neutron Spin ◽  
Elastic Neutron ◽  
New Model ◽  
Neutron Spin Echo ◽  
Elastic Neutron Scattering

We present the derivation of a new model to describe neutron spin echo spectroscopy and quasi-elastic neutron scattering data on liposomes.

scholarly journals High-resolution phonon energy shift measurements with the inelastic neutron spin echo technique

2019 ◽  
Vol 52 (4) ◽  
pp. 755-760 ◽  
Author(s):  
Fankang Li ◽  
Jiazhou Shen ◽  
Steven R. Parnell ◽  
Alex N. Thaler ◽  
Masaaki Matsuda ◽  
...  
Keyword(s):  
Energy Resolution ◽  
Phonon Dispersion ◽  
Spin Echo ◽  
National Laboratory ◽  
Energy Shift ◽  
Inelastic Neutron ◽  
Phonon Energy ◽  
Neutron Spin ◽  
Oak Ridge ◽  
Neutron Spin Echo

The energy resolution of the conventional way of measuring a small change in a phonon dispersion curve using neutron scattering is restricted by the relatively coarse intrinsic resolution ellipsoid of the neutron triple-axis spectrometer (TAS). By implementing inelastic neutron spin echo on the host TAS using the Larmor precession of the neutron spin, the energy resolution of such measurements can be further improved without reducing the resolution ellipsoid. Measurements of the temperature-dependent phonon energy change are demonstrated using superconducting magnetic Wollaston prisms at the HB-1 instrument of the High-Flux Isotope Reactor at Oak Ridge National Laboratory, and the achievable resolution is <10 µeV.

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