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XPAD X-ray hybrid pixel detector for charge density quality diffracted intensities on laboratory equipment

Abstract : The new generation of X-ray detectors, the hybrid pixel area detectors or `pixel detectors', is based on direct detection and single-photon counting processes. A large linearity range, high dynamic and extremely low noise leading to an unprecedented high signal-to-noise ratio, fast readout time (high frame rates) and an electronic shutter are among their intrinsic characteristics which render them very attractive. First used on synchrotron beamlines, these detectors are also promising in the laboratory, in particular for pump-probe or quasi-static experiments and accurate electron density measurements, as explained in this paper. An original laboratory diffractometer made from a Nonius Mach3 goniometer equipped with an Incoatec Mo microsource and an XPAD pixel area detector has been developed at the CRM2 laboratory. Mo K alpha accurate charge density quality data up to 1.21 angstrom(-1) resolution have been collected on a sodium nitroprusside crystal using this home-made diffractometer. Data quality for charge density analysis based on multipolar modelling are discussed in this paper. Deformation electron densities are compared to those already published (based on data collected with CCDAPEXII and CAD4 diffractometers).
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Emmanuel Wenger, Slimane Dahaoui, Paul Alle, Pascal Parois, Cyril Palin, et al.. XPAD X-ray hybrid pixel detector for charge density quality diffracted intensities on laboratory equipment. Acta Crystallographica Section B : Structural Science [1968-2013], International Union of Crystallography, 2014, 70 (5), pp.783-791. ⟨10.1107/S2052520614017338⟩. ⟨hal-01521315⟩



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