Journal Article

PreJuSER-15942

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Milli-electronvolt monochromatization of hard X-rays with a sapphire backscattering monochromator

Sergueev, I. ; Wille, H.-C. ; Hermann, R.FZJ* ; Bessas, D.FZJ* ; Shvydko, Y. V. ; Zajac, M. ; Rüffer, R.

2011
IUCr Chester

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Please use a persistent id in citations: doi:10.1107/S090904951102485X

Abstract: A sapphire backscattering monochromator with 1.1 (1) meV bandwidth for hard X-rays (20-40 keV) is reported. The optical quality of several sapphire crystals has been studied and the best crystal was chosen to work as the monochromator. The small energy bandwidth has been obtained by decreasing the crystal volume impinged upon by the beam and by choosing the crystal part with the best quality. The monochromator was tested at the energies of the nuclear resonances of (121)Sb at 37.13 keV, (125)Te at 35.49 keV, (119)Sn at 23.88 keV, (149)Sm at 22.50 keV and (151)Eu at 21.54 keV. For each energy, specific reflections with sapphire temperatures in the 150-300 K region were chosen. Applications to nuclear inelastic scattering with these isotopes are demonstrated.

Keyword(s): J ; X-ray optics (auto) ; monochromator (auto) ; energy resolution (auto) ; sapphire (auto) ; backscattering (auto) ; inelastic scattering (auto)

Note: The authors are very grateful to A. I. Chumakov for support during the experiment and for helpful discussions. RPH and DB acknowledge support from the Helmholtz Gemeinschaft Deutscher Forschungzentren for the Helmholtz University Young Investigator Group Lattice Dynamic in Emerging Functional Materials and from the DFG priority program SPP1386 'Nanostructured Thermoelectrics'.

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Contributing Institute(s):

1. Streumethoden (PGI-4)
2. Streumethoden (JCNS-2)
3. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)
2. Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) (P55)

Appears in the scientific report 2011

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