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Quasielastic Neutron Scattering and Solid State Diffusion$
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Rolf Hempelmann

Print publication date: 2000

Print ISBN-13: 9780198517436

Published to Oxford Scholarship Online: January 2010

DOI: 10.1093/acprof:oso/9780198517436.001.0001

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Experimental techniques

Experimental techniques

Chapter:
(p.158) 7 Experimental techniques
Source:
Quasielastic Neutron Scattering and Solid State Diffusion
Author(s):

Rolf Hempelmann

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198517436.003.0007

This chapter describes the practical aspects of quasielastic neutron scattering experiments and the necessary processing of raw data, including tips and tricks. The sample thickness has to be chosen as a compromise between sufficiently high scattering intensity and sufficiently low multiple scattering. For the background subtraction, self-shielding has to be taken into account, and then resolution corrections have to be performed. For complex situations with the superposition of several scattering components, a simultaneous fit enables the extraction of desired information from the data. Another problem is multiple scattering; corresponding correction strategies are outlined. Finally, the two spectrometer types most commonly used for quaisielastic neutron scattering experiments — time-of-flight instruments and backscattering instruments — are described in some detail. As a related method, quasielastic Mössbauer spectroscopy is briefly mentioned.

Keywords:   sample thickness, background subtraction, self-shielding, resolution corrections, simultaneous fits, spectrometer

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