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Application notes on the use of softer X-rays for anomalous powder diffraction
R J Cernik1, S Husheer, A D Smith
1Daresbury Laboratory, Warrington WA4 4AD, UK. r.j.cernik@dl.ac.uk
Journal of Synchrotron Radiation
|June 22, 2005
Summary
Powder diffraction data was collected for promazine hydrochloride using a modified diffractometer. Strong anomalous contrast near the sulfur absorption edge was observed, leading to a new instrument design for low-energy X-ray diffraction.
Area of Science:
- Materials Science
- Crystallography
- X-ray Diffraction
Background:
- Powder diffraction is crucial for material characterization.
- Collecting data near absorption edges enhances contrast.
- Low-energy X-ray diffraction (below 5.5 keV) presents unique challenges.
Purpose of the Study:
- To modify an existing diffractometer for powder diffraction of promazine hydrochloride.
- To investigate anomalous scattering effects at the sulfur absorption edge.
- To design a new diffractometer optimized for low-energy X-ray powder diffraction.
Main Methods:
- Modification of an in-vacuum diffractometer.
- Collection of powder diffraction data from promazine hydrochloride.
- Analysis of data for anomalous contrast at the sulfur absorption edge.
Main Results:
- Successful collection of powder diffraction data for promazine hydrochloride.
- Observation of strong anomalous contrast near the sulfur absorption edge.
- Design of a bespoke diffractometer for routine data collection below 5.5 keV.
Conclusions:
- The modified diffractometer enabled the observation of anomalous scattering.
- A new diffractometer design facilitates routine low-energy X-ray powder diffraction.
- This advancement improves the capability for studying materials using X-ray diffraction below 5.5 keV.