Modulation Spectrometry Of Neutrons With Diffractometry Applications
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A01=Pekka Hiismaki
Author_Pekka Hiismaki
Category=PDN
Category=PHM
Category=PHP
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Fourier Chopper
Fourier Modulation
Modulation Spectrometry
Neutron Diffraction
Neutron Instruments
Powder Diffraction
Pseudo-Random Modulation
Reverse Time-of-Flight
Single Crystal Excitations
Time-of-Flight
Product details
- ISBN 9789810227463
- Publication Date: 11 Jul 1997
- Publisher: World Scientific Publishing Co Pte Ltd
- Publication City/Country: SG
- Product Form: Hardback
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Modulation spectrometry of neutrons refers to a measuring principle, characterized by classification of neutron histories in a probabilistic way, not the usual deterministic way. In order to accomplish this, neutron beams entering the sample are modulated by high-transmission, white-beam selectors of the multislit type, such as Fourier or statistical choppers or high-frequency-modulated spin-flippers. In this scheme it is impossible to decide in a unique way through which particular slit any single neutron passed, but the distribution of histories for a large population of neutrons can nevertheless be correctly obtained, by classifying each conceivable history either as a high-probability or as a low-probability event, based on the actual observed state of the neutron selector. So far the principle has been successfully applied to powder diffraction, but it seems to offer extra degrees of freedom if applied to measuring dispersion curves of coherent excitations, such as phonons in single crystals.
