Setup for the determination of atomic distances

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.

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!