Following quantum dot growth with McSAS

2015/03/31 // 0 Comments

Thanks to Benjamin Abécassis (via Twitter), I got involved in an interesting project. Dr. Abécassis and coworkers had been doing in-situ measurements during synthesis of quantum dots, and were using McSAS to analyse their data. That allowed them to figure out what mechanistic models are unlikely to be valid for this synthesis and highlight one which is consistent with the measurements. This post is open to read and review on The [...]

…And then the assembly

2015/03/24 // 1 Comment

Today we had the new X-ray source arriving. It’s not working yet, but its imminent arrival spurred me into action to mount the Ultra-SAXS components in place and do some minor [...]

canSAS-8 meeting announcement.

2015/03/10 // 0 Comments

There is a very important meeting coming up soon for all those who dedicate themselves to excellence in small-angle scattering, and I for one, am very excited about this one. The canSAS-VIII meeting is full of interesting people giving interesting talks, complemented by plenty of (friendly) discussion sessions that are going to clarify the heading of the data reduction [...]

Calculating scattering by hand – example 1

2015/03/03 // 0 Comments

Those who read the older SAXS literature will note liberal use of Fourier transforms to calculate the scattering behaviour of odd-shaped particles. Likewise, the effects of smearing due to (for example) beam shape (think “blurring” of the scattering pattern) can be easily determined using such transforms. It is useful to get a feel for the methods for derivation of such Fourier transforms, so I decided it was time to refresh my rusty Fourier transform [...]

Why we never may be able to get a calibration curve: a matter of coherence

2015/02/17 // 9 Comments

For years, we have been trying to compare scattering patterns from different instruments. While this leads to reasonable results, there are precious few cases of true agreement despite the focus on data corrections (one example of agreement: [0]). My guess: we have not been considering coherence in these comparisons. This post is open to read and review on The [...]

Radiation safety for lab X-ray sources

2015/02/10 // 0 Comments

Over the years, I have followed several radiation safety courses in a variety of countries. Last week, it was NIMS’ turn to train me. As this was given in Japanese (a language I can only half follow), I decided to write my own section on radiation safety instead (for future inclusion in the book). This will draw on personal experience, things I remember from previous trainings and google’d knowledge, but I am fairly sure much of this is correct. Nevertheless, it is only in draft stage, and will still require an expert check, so use this at your own [...]

Everything SAXS – book growth

2015/01/27 // 1 Comment

Finally, I managed to get some time to work on the book again. When I last left it late December, the book structure and base was complete, but its content was missing. This is what I did so [...]
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