Forschungszentrum Jülich
in der Helmholtz-Gemeinschaft

Institut für Festkörperforschung (IFF)


Dr. H.-G. Haubold
Mitarbeiter am IFF-Institut:  
Streumethoden

 


Institut für Festkörperforschung
Forschungszentrum Jülich GmbH
D-52425 Jülich
Deutschland

Phone: +49 2461 61 5577
Fax: +49 2461 61 2610

E-Mail:

H.-G.Haubold@fz-juelich.de

 

  

 

Tätigkeitsfelder:
  1. Methodenentwicklung im Bereich der Röntgenstreuung mit Synchrotronstrahlung

  2. Katalysatoren

  3. Röntgenkleinwinkelstreuanlage JUSIFA am Hamburger Synchrotronstrahlungslabor HASYLAB


    4. Projektleitung: Weiterentwicklung und Betreuung der Meßstrecke JUSIFA

    Beteiligte Mitarbeiter:

    JUSIFA, Juelich's user-dedicated small-angle scattering facility
    at the synchrotron source DORIS in DESY/Hamburg, provides a small angle scattering beamline specifically designed for anomalous scattering experiments in materials science with a real space resolution on the length scale, D = 1/Q = 0.5 , ... ,100 nm. To cope with anisotropic scattering patterns, measurements are performed with pinhole collimation and a two- dimensional position sensitive detector, i.e. a multiwire proportional counter (MWPC) with 256 x 256 resolution elements (pixels) and 180 x 180 mm2 active area. To cover an extended region in reciprocal space, 5 different sample- detector distances can be set up, the samples, with a typical size 1.5 X 1.5 mm2, can be tilted relative to the incoming beam around two perpendicular axes in a diffractometer like rotation stage. For ease of measurement up to ten samples are mounted on preadjusted standardized multispecimen holders and positioned under computer control. This allows for running time-saving measurement programs, for instance with a series of differently prepared samples.

    The JUSIFA double crystal monochromator allows energy tuning fully under computer control by two independent crystal rotations and a horizontal translation of the second crystal for a fixed-exit operation. Beam height variations of the DORIS beam are corrected by a vertical translation of the first rotation stage.

    The set up of X-ray energy, sample detector distance, as well as the change and orientation of samples and internal references is controlled by a personal computer which itself is controlled by programs running on a larger workstation. The software allows to run a preselected program of measurements at several samples, internal references, and scattering backgrounds at a set of X-ray energies, e.g. near absorption edges and to determine the structural parameters of the nanostructures under study.

    Skizze der Anlage Design of JUSIFA --- ( click the image )

    Technical data
    X-ray source DORIS bending magnet
    Monochromator Fixed exit Si(311) double crystal with suppressed higher harmonics
    X-ray energies E = 5...32 keV, deltaE/E = 2 x 10-4
    Samples 1.5 x 1.5 mm2 typ.
    Detector 2-dimensional position sensitive multiwire Ar/CO2 gasdetector,
    256 x 256 pixels on180 x 180 mm2 active area
    Scattering vectors Q = 0.01 ... 1 Å-1
    Beam path Vacuum, point collimation

    Applications

    Literature on Instrumentation

    H.-G. Haubold, K. Gruenhagen, M. Wagener, H. Jungbluth, H. Heer, A. Pfeil, H. Rongen, G. Brandenburg, R. Moeller, J. Matzerarth, P. Hiller and H. Halling: Rev. Sci. Instrum. 60 (1989) p. 1943 - 1946

    Literature on ASAXS

    H.-G. Haubold, R. Gebhardt, G. Buth, G. Goerigk: Resonant anomalous X-ray scattering, Theory and applications, G. Materlik, C.J. Sparks, K. Fischer (Eds), 1994 Elsevier Science, p.295 - 304

 

Informationen zum downloaden:
FZJ-Homepage IFF-Homepage Search
Forschungszentrum Jülich, IFF, wwwiff@fz-juelich.de
Letzte Änderung: 15/10/2003, 09.18
URL: <http://www.fz-juelich.de /iff/personen/H.-G.Haubold/index.shtml>