On 12 January 2012 09:57, Dirk Kostrewa <kostr...@genzentrum.lmu.de> wrote:
> That doesn't sound wrong to me: the flexible parts are at different relative > positions in the unit cells and thus their "partial-structure scattering > waves" do not have a constant phase relation to each other, i.e., they don't > give a coherent contribution to the total scattering. >From http://scienceworld.wolfram.com/physics/IncoherentScattering.html : "Scattering for which reemission occurs by a cascade process, so the frequency of emission is not the same as that of the incident. ". We don't see any change of frequency (or wavelength) in the majority of the scattering from disordered regions so it's Rayleigh (coherent) scattering. There will be a small amount of Compton (incoherent) scattering resulting from the ionisation events which are responsible for radiation damage but hopefully freezing will keep this to a minimum. Cheers -- Ian
