Frequent questions and answers
Momentum transfer offers a mail-in-service for high-quality and high-throughput synchrotron X-ray powder diffraction measurements. You mail us your samples; we perform the measurements and send you the results.
Our services are suitable for both commercial and academic purposes. Customers own the rights to their results.
Beamtimes are regularly pre-arranged, meaning that there are no long waiting times for access to measurements. Compared to other methods of paid access, there is no minimum number of samples or shifts that must be purchased by the customer. Additionally, we provide data reduction and validation of results to ensure accuracy, including processing total scattering data to obtain pair distribution functions.
We assist users in various scientific endeavors. We can help determine the optimal measurements needed to solve their scientific problems and provide guidance on data interpretation to help users make sense of their findings. We specialize in performing structure refinement, utilizing methods such as Rietveld or real-space refinement. Furthermore, we have experience in determining various sample properties such as phase contents, impurities, crystallite size, bond lengths, and domain size in disordered materials. Our assistance also extends to aiding with crystal structure determination, including unit cell indexing, simulated annealing, reciprocal- and real-space co-refinements. Lastly, we offer statistical analyses for large datasets, allowing for in-depth exploration of the data.
We will provide a quotation on the desired services. Invoices for services can be paid by bank transfer within 30 days. We can also support payment via credit card.
Sample transparency and minimal issues with absorption or fluorescence for most elements. Thick samples can be used for probing larger sample volumes.
The experiment is setup in transmission geometry using a 2-dimensional detector. The setup is useful to reduce preferred orientation effects and to obtain symmetric line profiles.
Experiment Specifications
| Detector Distance | ~1.5 m |
| Q-range | ~0.16 – 9.1 Å-1 |
| d-spacing | 40 – 0.69 Å |
| Peak resolution | ~0.004 Å-1 (determined from first peak integral breadth) |
| Detector Distance | ~0.3 m |
| Q-range | ~0.32 – 31 Å-1 |
| d-spacing | 20 – 0.2 Å |
| Peak resolution | ~0.02 Å-1 |
| Usable Q-max | ≤20 - 30 Å-1 (depending on material) | |
| Real space Δd | approx. ≥0.16 – 0.11 Å (determined as π/Qmax) | |
| Maximum distance | ≤250 – 300 Å |
| Detector Distance | ~8.9 m |
| Q-range | ~0.01 – 0.37 Å-1 |
| d-spacing | ~630 – 17 Å |
Using high energy X-rays (75 keV) and highly monochromatic radiation combined with 2D detection results in a sharp and symmetric instrumental profile which is ideal for detecting low-intensity features, decomposing overlapping features, and distinguishing microstructural properties.
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