Category Archives: Looking into something

Does it matter part 5.1: Detector linearity

Time for another short investigation into data corrections? Good. Let’s take a quick look at the linearity of our Bruker HiStar detector.

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Calculating scattering by hand – example 1

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 […]

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The Dark Side of Science.

A little step sideways from small-angle scattering for this week’s post. As you are probably aware by now, I sometimes use the LaN weblog to crystallize ideas into something resembling a coherent story. This is needs to be done now, as I am preparing another presentation (due late January), one that covers a tangential topic […]

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Guinier in polydisperse systems revisited

Last week, I was contacted by Christian Gollwitzer (author of this excellent paper) about something posted here (and in particular detailed in this document) a while ago. It concerns the behaviour of the Guinier approxiation for polydisperse systems, and it looks like I made a mistake when writing that document. This paper is currently available […]

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Comparisons of Doom: line vs. pinhole.

[ed: My current project is running at an end, so if you happen to have a job offer I cannot refuse, I will seriously weigh it against the (tenured) job offer I got from NIMS!] The typical argument in favor of the line-collimated “Kratky”-type instruments is that its X-ray flux is very high and that […]

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Intensity in density

A few weeks ago, a dataset landed on my desk from a very dense system: scattering from dry, packed SiO2 nanoparticle powder. Dense systems add a degree of complexity to small-angle scattering, so it was interesting to try (play) and find a solution to this.

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Guest post by Dr. Jan Ilavsky: Meet an Ultra-scatterer!

[ED: I’ve started asking around for guest contributions for the LookingAtNothing site, in order to provide a broader view of the SAS-related activities than I could ever hope to achieve by myself. Our second guest to talk about his work is Dr. Jan Ilavsky of the Argonne National Laboratory.] Maybe you heard my name, Jan Ilavsky, perhaps in association with […]

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Guest Post by Dr. Grégory Stoclet: Crazy deformation of polymers, studied with in-situ SAXS.

[ED: I’ve started asking around for guest contributions for the LookingAtNothing site, in order to provide a broader view of the SAS-related activities that I could ever hope to achieve by myself. Our first guest to talk about his work is Dr. Grégory Stoclet of UMET at the Université Lille 1.] PLA is a new […]

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12 corrections in a row

Just a couple of housekeeping notes: I’m giving talks in Europe in a month at the following locations: Unité Matériaux et Transformations (UMET), Lille on May 16, hosted by Grégory Stoclet, Birmingham University, Birmingham on the 20th of May, hosted by Zoe Schnepp, Nottingham University, Nottingham, on the 23rd of May, hosted by Philip Moriarty, […]

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How to fit a scattering pattern part 1: the initial look.

By the way, my topical review paper on SAXS data collection and correction has been published and is available open access here!   Recently, some good colleagues (who are not familiar with scattering) have started asking questions on how to go about fitting a scattering pattern. This was a very good opportunity to think about […]

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