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The instrumental resolution function of synchrotron radiation powder diffractometers in the presence of focusing optics
Author(s) -
Gozzo Fabia,
De Caro Liberato,
Giannini Cinzia,
Guagliardi Antonietta,
Schmitt Bernd,
Prodi Andrea
Publication year - 2006
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889806009319
Subject(s) - collimated light , optics , powder diffractometer , resolution (logic) , beamline , synchrotron radiation , physics , materials science , beam (structure) , diffraction , laser , artificial intelligence , computer science
The theory developed by Caglioti and co‐workers [Caglioti, Paoletti & Ricci (1958). Nucl. Instrum. 3 , 223–228; Caglioti, Paoletti & Ricci (1960). Nucl. Instrum. Methods , 9 , 195–198; Caglioti & Ricci (1962). Nucl. Instrum. Methods , 15 , 155–163] and Sabine [(1987). J. Appl. Cryst. 20 , 23–27, 173–178] that provides an analytical description of the instrumental resolution function of single‐crystal and powder diffractometers consisting of sequences of collimators and crystals is extended by including the effect of collimating and refocusing mirrors. A simple analytical expression with only two fitting parameters (the beam divergence after reflection by the collimating and the refocusing mirrors) is determined, this expression being applicable to all mirror settings. The new theory is applied to experimental data collected at the Swiss Light Source Materials Science beamline powder diffractometer for three photon energies under extreme mirror bending conditions using the small‐linewidth powder sample Na 2 Ca 3 Al 2 F 14 .