Future directions in quasi-elastic neutron scattering
β Scribed by A.J. Dianoux
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 737 KB
- Volume
- 182
- Category
- Article
- ISSN
- 0921-4526
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β¦ Synopsis
Several 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. Finally it is stressed that quasi-elastic neutron scattering (QENS) is certainly the most versatile spectroscopic technique, but that it is highly dependent upon the availability of high-intensity neutron sources and sophisticated instrumentation.
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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 55Β°C were determined and show two distinct regions. The relaxation times 7, are higher by a factor of 10 to