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- Detector modelling and simulations II (electric fields, charge transport, multiplication and induction, pulse formation, electron emission, etc) (1)
- Energy-dispersive Laue diffraction (1)
- Interaction of radiation with matter (1)
- Solid state detectors (1)
- X-ray imaging (1)
- X-ray spectroscopy (1)
- pnCCD (1)
Institute
A crystal of hen egg-white lysozyme was analyzed by means of energy-dispersive X-ray Laue diffraction with white synchrotron radiation at 2.7 angstrom resolution using a pnCCD detector. From Laue spots measured in a single exposure of the arbitrarily oriented crystal, the lattice constants of the tetragonal unit cell could be extracted with an accuracy of about 2.5%. Scanning across the sample surface, Laue images with split reflections were recorded at various positions. The corresponding diffraction patterns were generated by two crystalline domains with a tilt of about 1 degrees relative to each other. The obtained results demonstrate the potential of the pnCCD for fast X-ray screening of crystals of macromolecules or proteins prior to conventional X-ray structure analysis. The described experiment can be automatized to quantitatively characterize imperfect single crystals or polycrystals.