title: Extraction of accurate structure-factor amplitudes from Laue data: wavelength normalization with wiggler and undulator X-ray sources.
abstract: Wavelength normalization is an essential part of processing of Laue X-ray diffraction data and is critically important for deriving accurate structure-factor amplitudes. The results of wavelength normalization for Laue data obtained in nanosecond time-resolved experiments at the ID09 beamline at the European Synchrotron Radiation Facility, Grenoble, France, are presented. Several wiggler and undulator insertion devices with complex spectra were used. The results show that even in the most challenging cases, such as wiggler/undulator tandems or single-line undulators, accurate wavelength normalization does not require unusually redundant Laue data and can be accomplished using typical Laue data sets. Single-line undulator spectra derived from Laue data compare well with the measured incident X-ray spectra. Successful wavelength normalization of the undulator data was also confirmed by the observed signal in nanosecond time-resolved experiments. Single-line undulators, which are attractive for time-resolved experiments due to their high peak intensity and low polychromatic background, are compared with wigglers, based on data obtained on the same crystal.
authors.affiliation: Department of Biochemistry and Molecular Biology, The University of Chicago, 920 East 58th Street, Chicago, IL 60637, USA. vusr@midway.uchicago.edu
authors.forename: V
authors.initials: V
authors.lastname: Srajer
authors.forename: S
authors.initials: S
authors.lastname: Crosson
authors.forename: M
authors.initials: M
authors.lastname: Schmidt
authors.forename: J
authors.initials: J
authors.lastname: Key
authors.forename: F
authors.initials: F
authors.lastname: Schotte
authors.forename: S
authors.initials: S
authors.lastname: Anderson
authors.forename: B
authors.initials: B
authors.lastname: Perman
authors.forename: Z
authors.initials: Z
authors.lastname: Ren
authors.forename: T Y
authors.initials: TY
authors.lastname: Teng
authors.forename: D
authors.initials: D
authors.lastname: Bourgeois
authors.forename: M
authors.initials: M
authors.lastname: Wulff
authors.forename: K
authors.initials: K
authors.lastname: Moffat