title: Optimal fine φ-slicing for single-photon-counting pixel detectors.
abstract: The data-collection parameters used in a macromolecular diffraction experiment have a strong impact on data quality. A careful choice of parameters leads to better data and can make the difference between success and failure in phasing attempts, and will also result in a more accurate atomic model. The selection of parameters has to account for the application of the data in various phasing methods or high-resolution refinement. Furthermore, experimental factors such as crystal characteristics, available experiment time and the properties of the X-ray source and detector have to be considered. For many years, CCD detectors have been the prevalent type of detectors used in macromolecular crystallography. Recently, hybrid pixel X-ray detectors that operate in single-photon-counting mode have become available. These detectors have fundamentally different characteristics compared with CCD detectors and different data-collection strategies should be applied. Fine φ-slicing is a strategy that is particularly well suited to hybrid pixel detectors because of the fast readout time and the absence of readout noise. A large number of data sets were systematically collected from crystals of four different proteins in order to investigate the benefit of fine φ-slicing on data quality with a noise-free detector. The results show that fine φ-slicing can substantially improve scaling statistics and anomalous signal provided that the rotation angle is comparable to half the crystal mosaicity.
authors.affiliation: Swiss Light Source at Paul Scherrer Institut, Villigen, Switzerland. marcus.mueller@dectris.com
authors.forename: Marcus
authors.initials: M
authors.lastname: Mueller
authors.forename: Meitian
authors.initials: M
authors.lastname: Wang
authors.forename: Clemens
authors.initials: C
authors.lastname: Schulze-Briese
mesh_terms: D018360:Crystallography, X-Ray / Q000379:methods*; D009113:Muramidase / Q000032:analysis / Q000737:chemistry; D017785:Photons
chemical_list: D009113:Muramidase