Setup for the determination of atomic distances

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SIMPLIFIED HANDLING - EVEN IN SMALL LABORATORIES

At the TU Berlin, Prof. Dr. Birgit Kanngiesser‘s “Analytical X-ray Physics“ group succeeded in developing a method that efficiently uses the light of an X-ray tube and directs it to a detector with little loss of brilliance. This allows measurements for the determination of atomic distances to be carried out even in smaller laboratories. OWIS positioning systems simplify the handling decisively.

Fig. 1

Fig. 2

Atomic distances were often determined using EXAFS spectroscopy (Extended X-ray Absorption Fine Structure) and using a synchrotron. The size of the synchrotron radiation generator is problematic here, because the rings of the particle accelerator can only be set up in very large halls and operated by experts. The measurement itself requires the high brilliance, but only a small fraction of the synchrotron light. The schematic diagram above shows the setup of the X-ray spectroscopy method developed at the TU Berlin.

Fig. 3

For a cooperation between TU Berlin and the Max-Planck Institute for Chemical Energy Conversion in Muelheim an der Ruhr, we have built two manipulators by combining several axes. Thus, the optic (fig. 1) and the detector (fig. 2) can be aligned highly precise to the beam. The distance to the light source can be adjusted via the two linear axes. The optic rotates with a positioning system of two rotary measuring stages DMT 40 and DMT 65 in two directions of motion. The detector is moved in four degrees of freedom. For this purpose, we have combined high-precision goniometer MOGO 65, rotary measuring stage DMT 65, precision linear stage LTM 60 and elevator stage HVM 100N.

The X-ray spectrometer (fig. 3) has proved itself in practice. Another system for use in vacuum is being planned. For this, an optic with higher resolution is being developed and the OWIS Vacuum product line for high vacuum with pressures up to 10-6 mbar is being integrated.

Our product manager Dr. Johannes ter Wolbeek knows what to do when the air gets thin. Are you involved in vacuum applications? Then get in touch with him!

Products used in this application

DMT 40

  • for use with SYS 40
  • retainer ø 25 mm, aperture ø 20 mm
  • step or DC motor with encoder, angular contact ball bearings, worm gear, limit switches

DMT 65

  • for use with SYS 65
  • rotary table with retainer, aperture or threaded hole
  • step or DC motor with encoder, angular contact ball bearings, worm gear, limit switches

MOGO 65-40-65

  • for use with SYS 65 and SYS 90
  • industrial application
  • adjustment range ± 20°, height of rotating axis 65 mm

LTM 60 (P/F/M)

  • travel range 20 - 145 mm
  • industrial application
  • step or DC motor with encoder, recirculating ball bearing guides, fine-thread spindle, limit switches

HVM 100N

  • travel range 30 mm
  • industrial application, high repeatability
  • step or DC motor with encoder, cross roller guides, limit switches

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