Unexpected wavelength depent intensity Roughness vs. ParticleLayout
|Status:||Rejected||Start date:||14 Nov 2016|
When implementing a DWBA model I would expect the intensities of the structure factors to mostly depend (in first order) on the values of k_i and k_f, as these define the Fresnel coefficients. For a simulation with different incident wavelength but same k_i I would expect a similar result, which might be a bit distorted due to different refraction.
Especially, I would expect that roughness scattering to behave the same way as scattering from particles when they occur within the same layer.
I have build a simulation with a set of layers, where layer 2 has a roughness and 2D paracrystal of cylinders. Simulating the GISANS from this model for different lambda and constant k_i yields virtually identical roughness scattering but 3 orders of magnitude different intensity from the particles.
(As I wasn't sure which layer the roughness needs to be in to have the same prefactors I repeated this with particles in layer 2 and roughness for layer 3. Beam and detector resolution is included to rule out numerical effects from the simulation grid.)