X-ray Diffraction: microbeam

EMSL's microbeam diffractometer is a Rigaku rotating anode with micro focus optics, automated x-y stage, and a curved image plate detector. Both Cu and Cr anodes are available for use. With specialized optics and collimators the highest spatial resolution is 10 microns, unfocused 70 microns.

Two dimensional detectors such as curved image plate detectors, allows collection of a larger section of the Ewald sphere. This has many advantages including decreased data collection time required for the same signal-to-noise ratio.

Possible sample geometries

• Fiber mount — small particles or aggregates
• Flat samples — x-y mapping of petrographic thinsections
• Capillary tubes — anaerobic samples

Full Size (gif 23kb)

Curved Image Plate Detector The generator is the Rigaku MicroMax-007 HF paired with a image plate detector.

Cr source eliminates Fe fluorescence background Cu versus Cr anode. Choice of Cr anode for the analysis Fe containing samples results in less flux on the sample than Cu anode. However the background is lower since Fe fluorescence is not excited by the lower energy incident x-ray. Full Size (gif 16kb)

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