This page contains the list of (Youtube) videos I have made over time explaining SAXS and some of its workings. They are mostly sorted in order of appearance (newest on top)
Introducing dr. Julian Rosalie (more information):
Introducing dr. Shivani Sharma (more information):
Some new 2D fitting work I am developing at the moment (more information):
A presentation detailing my current work (more information):
A presentation with advice for scientific presenters (more information):
A presentation discussing a small-angle scattering technicality, what is the visibility of particular sizes in polydisperse samples? (more information):
A promotional video for a NIMS workshop:
A demonstration of small-angle scattering from a hair. This is a demonstration in which beams of laserlight (two lasers with different wavelengths are used to demonstrate the effect of different wavelengths as well) is shone upon two human hair samples. A small-angle scaattering pattern is seen on a whiteboard and analysed to determine the diameter of the hairs.
…and the calculation of their diameters from the small-angle scattering pattern
A demonstration of what we would see when we scatter from some samples, using a live Fourier Transform image of a laptop camera:
An explanation of what I did from 2009 to 2011 with a concise SAXS explanation and some elaboration on analysis methods:
A short explanation of small-angle scattering:
Hey!great videos, thanks!but i think at the 3rd one, where you calculate the diameters, towards the end of the video (around 4:17) you say q is wavelength independent, do you mean r is independent since you calculate q taking into account wavelength?
Hi Celen,
Thank you for your question. The definition of the scattering angle q makes this scattering angle independent of wavelength (this is achieved by dividing by the wavelength). Anything we calculate using q, such as the radius r, will then automatically also be wavelength independent.
So, if I understand your question correctly, the numerical values for the angle q are already wavelength independent because of the way we calculate these q-values.
This is not the case in the diffraction world, where the angles are usually given in degrees. While degrees are more closely associated with the concept of angles, these degrees are only useful if the wavelength is also given for that particular measurement.
Please let me know if this answered your question, otherwise I’ll try again :).
Good afternoon Brian,
I wish to incorporate your video, entitled: “Small-angle X-ray Scattering (no voice-over, no closed caption)” in my x-ray safety training for my students. May I have your permission to do so? I will acknowledge your authorship of this clip in my presentations.
Thanks for kind consideration.
Auggie
Hi Auggie,
Sure thing, I’ve sent you the links to the full-scale versions in an e-mail.
Cheers,
B.
hi nice vids,
I wish to use your hi-res video in one of my presentations,
thank you very much.
Your videos seem to imply that scattered intensity can pass through the beam stop. This doesn’t seem to make any sense.
Dear Marty, That was more due to a limitation in my raytracing skills rather than a lack of understanding. In the simulated data and model data the beamstop is not explicitly drawn. Once I learn something else (Blender or somesuch), I might be able to update some of the videos, but until then I’m afraid there’s not much I can do.
Hi Brian,
I’d like to use your video “Small-angle X-ray Scattering (no voice-over, no closed caption)” in the ppt presentation of my diploma thesis which is based on usage of SAXS in regards of conformation of biopolyelectrolytes. May I have your permission to do so? I will acknowledge your authorship of this clip in my ppt.
Thanks