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A new aspherical scattering factor formalism has been implemented in the crystallographic least‐squares refinement program SHELXL. The formalism relies on Gaussian functions and can optionally complement the independent atom model to take into account the deformation of electron‐density distribution due to chemical bonding and lone pairs. Asphericity contributions were derived from the electron density obtained from quantum‐chemical density functional theory computations of suitable model compounds that contain particular chemical environments, as defined by the invariom formalism. Thanks to a new algorithm, invariom assignment for refinement in SHELXL is automated. A suitable parameterization for each chemical environment within the new model was achieved by metaheuristics. Figures of merit, precision and accuracy of crystallographic least‐squares refinements improve significantly upon using the new model.
Acta Crystallographica Section A: Foundations and Advances – Wiley
Published: Jan 1, 2019
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