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Contents
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Congratulations! You have just been awarded time on XPDF at Diamond.
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Please confirm with your local contact the number of ex situ / in situ samples that you intend to analyse and an indication of priority. This will help the beamline staff to plan any sample environment changeovers accordingly. |
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When sending goods to Diamond please include the name of your local contact and arange arrange delivery to the following address;
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Diamond Light Source Ltd
DLS Goods Handling, Zone 8
Synchrotron Stores
Harwell Science and Innovation Campus
Didcot
Oxfordshire
OX11 0DE
Inform your local contact of any packages that you are sending and provide them with information such as tracking numbers and estimated delivery dates.
Know Your Samples
It is important to characterise the samples for a PDF experiment as comprahensively as possible before the beamtime. The three key properties that are required are;
- Sample composition - Quantitative analysis should be performed to identify the most accurate composition possible for the samples.
- Density - The density of the sample should be known in either g cm-3 or atoms Å-3.
- Packing fraction - This is a value between 0-1 and is often estimated to be ca. 0.6.
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The sample composition, density and packing fraction are essential parameters that should be known as accurately as possible in order to perform the data reduction step and generate the PDFs. |
There are additional factors that should be considered regarding the samples, such as;
- Are there any peaks at low Q? This may require the beamstop to be moved further from the sample. If you have a peak at Q ≤ 1 Å-1 then your local contact should be made aware before the experiment and given a friendly reminder at the start of your beamtime. Q is related to theta via the equation outlined below.
- Have you simulated the pdf and the scattering data for comparison?
Know Your Setup
Capillary