A versatile X-ray diffraction station at LNLS (Brazil)

Abstract

Versatility was a major consideration in the project to provide an X-ray diffraction station at LNLS. At least two techniques are possible at the station: powder diffraction and multiple singlecrystal diffraction. A two-crystal monochromator based on monolithic elastic translators, developed at LNLS, with sagittal focusing by the second crystal, allows 10 mrad of a !2 keV monochromatic beam to be used on the diffractometer. The station is equipped with a fast scintillation detector, imaging plates, a high-energy-resolution pin-diode detector, an ionization chamber and a high-angular-resolution soller slit. The data collection and control hardware and software were also developed at LNLS. The ±2 goniometry for powder diffraction on this 1 mdiameter diffractometer is based on commercial rotation tables. The multiple single-crystal goniometry is realized by an independent elastic axis driven by differential micrometers for both high-and low-resolution angular movements. At least four independent axes can be positioned as necessary on the diffractometer table. Powder diffractograms and double-crystal rocking curves collected with the synchrotron beam show the expected quality.

Characterization of the Structural Environment of Dithionate Ions Associated with Their Role in the Crystal Habit Modification of Sodium Chlorate

“…15 X-ray multiple diffraction (XRMD) measurements (see S2 in the supplementary material for information of this technique) were carried out in Renninger scan mode for the large single crystals at XRD1 beamline of LNLS, Brazil. 16 The wavelength was 1.5498(5) Å with the beam size of 1mm x 1 mm. The diffraction peaks on XRMD patterns were indexed by the calculation from the UMWEG program 17 based on the crystal structure of NaClO3 as published by Abrahams and Bernstein (1977).…”

Identification Of Molecular Structures Of Normal And Pathological Human Breast Tissue Using Synchrotron Radiation

“…The experiment was carried out at the D12A-XRD1 beam line in the National Synchrotron Light Laboratory (LNLS), Campinas, Brazil [19]. The experimental setup consists basically of a synchrotron light source with an 1.37GeV electron storage ring, delivering approximately 5x10 10 photons.s -1 at 11keV, a mirror to filter photons of high energies and for vertical focusing of the beam, a double-crystal Si (111) monochromator used to provide an x-ray beam energy fixed at 11keV and to reduce the irradiation area on the sample (3.0mm x 1.0 mm) and a Huber three-circle diffractometer operating in transmission mode, where the sample was assembled on a rotative table, 210mm away from the detector.…”

An inelastic X-ray scattering spectrometer at LNLS

“…Although this beamline was conceived for powder and singlecrystal diffraction, it was designed to be versatile in order to be able to mount different types of X-ray experiments. A detailed description of this beamline can be found by Cusatis et al (1998). In this section, the principal components of the beamline are brie¯y described.…”