Journal of Applied Crystallography

Volume 33, Part 3 Number 2 (June 2000)

research papers

J. Appl. Cryst. (2000). 33, 888-892 [ doi:10.1107/S0021889800001904 ]

Icosahedral quasicrystals applied as a harmonic-free crystal analyser

M. J. Capitan and J. Alvarez

Abstract: The use of quasicrystals as crystal analysers has been studied in monochromatic X-ray synchrotron radiation applications. The quasiperiodicity of their structures gives a theoretical third-harmonic rejection factor of up to 5 × 10^-4 when the icosahedral (20,32) Bragg peak is used. This ratio is compared with the intrinsic value for silicon perfect crystals in Bragg configuration, namely 2 × 10^-2. This rejection factor may be increased for some well defined configurations, as reported elsewhere for the case of periodic crystals.