The evanescent neutron wave diffractometer: On the way to surface sensitive neutron scattering

A novel experimental technique to observe the Bragg scattering of evanescent neutron waves is presented. The so‐called EVA diffractometer, installed at the high‐flux reactor of the Institut Laue‐Langevin, allows the identification of neutron scattering from single crystal surfaces. We discuss the ex...

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Bibliographic Details
Published in:Review of scientific instruments 1992-12, Vol.63 (12), p.5533-5542
Main Authors: Dosch, H., Al Usta, K., Lied, A., Drexel, W., Peisl, J.
Format: Article
Language:English
Subjects:
Exact sciences and technology
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Other topics in instruments, apparatus, components and techniques common to several branches of physics and astronomy
Physics
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Summary:A novel experimental technique to observe the Bragg scattering of evanescent neutron waves is presented. The so‐called EVA diffractometer, installed at the high‐flux reactor of the Institut Laue‐Langevin, allows the identification of neutron scattering from single crystal surfaces. We discuss the experimental setup, intensity, and resolution considerations and some first Bragg scattering signals from evanescent neutron waves excited at CaF2, InP, and MnF2 single crystal surfaces. The experimental results are discussed within the framework of the so‐called distorted wave Born approximation and within a dynamical scattering theory. The limitations of both theoretical approaches to describe the Bragg scattering of evanescent neutron waves are indicated.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1143841