![]() Once the data is processed, routine structures can be ready to publish in an hour or two. Workup of the data may take an hour or so. Generally, a one hour reservation is sufficient for one sample.įor single crystal work, data collection generally will run overnight once a suitable crystal is found. Setup may take about the same amount of time. If you cancel before noon, you will not be charged for the day.įor powder diffraction on the Spider with a loose powder, a typical exposure time is between 10 and 20 minutes. If you decide after screening some crystals, that your sample is not suitable, you should cancel your reservation. For single crystal work, you should reserve the instrument for the entire day. Once you been trained and taken the safety courses, you can reserve instrument time on any of the available instruments ( ). How can I ensure that an instrument is available? See the lab manager for more information. For single crystal experiments, you can be trained to run your own samples or you can submit them to the lab manager for analysis. You will have to run your own powder samples. The powder diffraction instruments are self serve. Crystal quality and sample composition are both important components in determining a crystal’s usefulness for structure determination. If you can see the crystals with the naked eye, they are probably big enough. When in doubt, bring them by the X-ray lab and look at them through the microscope. Where two crystal faces join, the edge will be well defined. But good crystals will have a well defined shape, be it plates, needles, prisms. You don’t until you put it in the X-ray beam and see if it diffracts. How do I know if my crystals are ‘X-ray quality’? The two most common methods for crystal growth are slow evaporation and vapor diffusion. There are many websites with useful ideas for growing crystals. DON’T take the crystals out of the solution. Bring the sample container to the X-ray lab (FNT B.104 (lab) FNT B.108 (office) 471-4042).
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