关键词: RATIO method absorption anisotropy data scaling photocrystallography residual analysis

Mesh : Anisotropy Coordination Complexes / analysis chemistry Crystallography, X-Ray / methods Data Collection Least-Squares Analysis Silver / chemistry Synchrotrons

来  源:   DOI:10.1107/S2053273315024055   PDF(Sci-hub)

Abstract:
Two methods for scaling of multicrystal data collected in time-resolved photocrystallography experiments are discussed. The WLS method is based on a weighted least-squares refinement of laser-ON/laser-OFF intensity ratios. The other, previously applied, is based on the average absolute system response to light exposure. A more advanced application of these methods for scaling within a data set, necessary because of frequent anisotropy of light absorption in crystalline samples, is proposed. The methods are applied to recently collected synchrotron data on the tetra-nuclear compound Ag2Cu2L4 with L = 2-diphenylphosphino-3-methylindole. A statistical analysis of the weighted least-squares refinement residual terms is performed to test the importance of the scaling procedure.
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