title: Energy resolution of the CdTe-XPAD detector: calibration and potential for Laue diffraction measurements on protein crystals.
abstract: The XPAD3S-CdTe, a CdTe photon-counting pixel array detector, has been used to measure the energy and the intensity of the white-beam diffraction from a lysozyme crystal. A method was developed to calibrate the detector in terms of energy, allowing incident photon energy measurement to high resolution (approximately 140 eV), opening up new possibilities in energy-resolved X-ray diffraction. In order to demonstrate this, Laue diffraction experiments were performed on the bending-magnet beamline METROLOGIE at Synchrotron SOLEIL. The X-ray energy spectra of diffracted spots were deduced from the indexed Laue patterns collected with an imaging-plate detector and then measured with both the XPAD3S-CdTe and the XPAD3S-Si, a silicon photon-counting pixel array detector. The predicted and measured energy of selected diffraction spots are in good agreement, demonstrating the reliability of the calibration method. These results open up the way to direct unit-cell parameter determination and the measurement of high-quality Laue data even at low resolution. Based on the success of these measurements, potential applications in X-ray diffraction opened up by this type of technology are discussed.
authors.affiliation: Synchrotron Soleil, BP 48, Saint-Aubin, Gif sur Yvette 91192, France. kadda.medjoubi@synchrotron-soleil.fr
authors.forename: Kadda
authors.initials: K
authors.lastname: Medjoubi
authors.forename: Andrew
authors.initials: A
authors.lastname: Thompson
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Bérar
authors.forename: Jean-Claude
authors.initials: JC
authors.lastname: Clemens
authors.forename: Pierre
authors.initials: P
authors.lastname: Delpierre
authors.forename: Paulo
authors.initials: P
authors.lastname: Da Silva
authors.forename: Bernard
authors.initials: B
authors.lastname: Dinkespiler
authors.forename: Roger
authors.initials: R
authors.lastname: Fourme
authors.forename: Patrick
authors.initials: P
authors.lastname: Gourhant
authors.forename: Beatriz
authors.initials: B
authors.lastname: Guimaraes
authors.forename: Stéphanie
authors.initials: S
authors.lastname: Hustache
authors.forename: Mourad
authors.initials: M
authors.lastname: Idir
authors.forename: Jean-Paul
authors.initials: JP
authors.lastname: Itié
authors.forename: Pierre
authors.initials: P
authors.lastname: Legrand
authors.forename: Claude
authors.initials: C
authors.lastname: Menneglier
authors.forename: Pascal
authors.initials: P
authors.lastname: Mercere
authors.forename: Frederic
authors.initials: F
authors.lastname: Picca
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Samama
mesh_terms: D000818:Animals; D002138:Calibration; D002645:Chickens; D018360:Crystallography, X-Ray / Q000379:methods*; D009113:Muramidase / Q000737:chemistry*; D017785:Photons; D017356:Synchrotrons / Q000295:instrumentation
chemical_list: D009113:Muramidase