X-Ray Diffraction

6-circle (PSIC) diffractometer using a Cu source

X-ray reflectometer using a Mo source

Responsible: Dr. Vedran Vonk

The DESY Nanolab operates three separate X-ray set-ups. The first is a dedicated X-ray reflectometer, equipped with a molybdenum X-ray tube and adapted multilayer optics, giving a line focus at the sample position. The second set-up is a full 6-circle diffractometer, which is used in combination with a copper tube source. Here, the multilayer optics focuses in two dimensions, resulting in a point focus at the sample position. The third set-up is a 6-circle (SIXC) heavy load diffractometer as well with a copper tube source.

The X-ray lab is situated in building 25, EG 023.

Sample Environments (most of them can be used only in cooperation with our group)

Catalysis:

UFO chamber mini reactor (no UHV, only operando); high pressure reaction chamber (up to 50 bar)

For Surface and Materials Science:

in-situ UHV chamber RT- 1500 K; 10-10 - 10-5 mbar in-situ oxidation; chamber RT - 900 K, 10-9 - 2000 mbar in-situ solid state

electrochemistry chamber RT - 900 K 10-9 -1000 mbar, needle tip to contact local sample areas together with optical microscope

For Electrochemistry:

hanging meniscus cell, flow cell, setup for in-situ rotating disc electrode experiments, in-situ HE XRD and FT IRRAS setup

Reflectometer

Characteristics
Mo-Kalpha
• spot size: 12x0.3 mm2 (HxV)
• divergence: 0.4 mrad (V)
• type: theta-2theta scans
• control software: SPEC
• detectors: Point detector or Strip detector (Mythen)

Six-circle Diffractometer

Characteristics
Cu-Kalpha
• spot size: 0.25x0.25 mm2 (HxV)
• divergence: 5x5 mrad2 (HxV)
• type: full reciprocal space access
• control software: SPEC
• detectors: Point detector or Strip detector (Mythen)

Contact: Dr. Vedran Vonk
Tel. +49 (0)40 - 8998 6012

vedran.vonk@desy.de

6-circle (SIXC) heavy load diffractometer using a Cu source