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Oscillation camera data processing. 3. General diffraction spot size, shape and energy profile: formalism for polychromatic diffraction experiments with monochromatized synchrotron X‐radiation from a singly bent triangular monochromator
Author(s) -
Greenhough T. J.,
Helliwell J. R.,
Rule S. A.
Publication year - 1983
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/s0021889883010316
Subject(s) - monochromator , diffraction , synchrotron radiation , bent molecular geometry , optics , formalism (music) , synchrotron , physics , oscillation (cell signaling) , chemistry , wavelength , art , musical , biochemistry , organic chemistry , visual arts
The size and shape of diffraction spots produced by monochromated synchrotron X‐radiation from a singly bent triangular monochromator are derived following a simpler more comparative treatment given in earlier work on reflecting range and prediction of partiality for oscillation camera data [Greenhough & Helliwell (1982). J. Appl. Cryst. 15 , 493–508]. In that treatment the possibility of a polychromatic experiment {[see Arndt Nucl. Instrum. Methods (1978), 152 , 307–311] for an earlier suggestion} was identified and here the energy profile within each diffraction spot is derived along with the spectral resolution ∂E/E at any point in the profile due to experimental conditions and sample characteristics. A firm theoretical basis is established so that experimental problems and procedures can be discussed with a view to optimizing the method in the light of the presentation of the first reported polychromatic experiment [Arndt, Greenhough, Helliwell, Howard, Rule & Thompson (1982). Nature ( London ), 298 , 835–838].