Nontrivial Role of the Resolution Function in the Formation
of Double-Crystal X-Ray Rocking Curves

M. A. Chuev^a, E. M. Pashaev^b, V. V. Kvardakov^b, and I. A. Subbotin^c

^a Institute of Physics and Technology, Russian Academy of Sciences, Nakhimovski pr. 36/1, Moscow, 117218 Russia
e-mail: chuev@ftian.ru

^b Russian Research Centre Kurchatov Institute, pl. Akademika Kurchatova 1, Moscow, 123182 Russia

^c Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninski pr. 59, Moscow, 119333 Russia

Received February 18, 2008

Abstract—A theoretical analysis of the shape of the resolution function of an X-ray diffractometer in the dou-
ble-crystal nondispersive scheme for measuring rocking curves has been performed. It is shown that this func-
tion, along with the strong narrow central line (corresponding to the characteristic line to which the collimator
crystal and slits in the experimental scheme are tuned) always contains an additional weak satellite, correspond-
ing to the neighboring characteristic line. This feature manifests itself in experimental curves as an additional
pseudopeak, whose intensity is comparable with the corresponding diffraction scattering intensity from a sam-
ple in the fundamental characteristic line, and whose shape and exact position are set by the resolution function
in a specific experimental scheme. It is shown that the exact allowance for the angular and spectral distribution
of incident radiation in the double-crystal scheme makes it possible to precisely determine the parameters of
the structures studied.

PACS numbers: 61.10.-i

DOI: 10.1134/S1063774508050027

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