### Uncorrelated mixture of particles

Scattering from a mixture of cylinders and prisms without interference.

• The sample comprises a substrate on which are deposited, in equal proportion, cylinders and prisms.
• All particles are made of the same material.
• Each type of particle has the same orientation.
• The cylinders are $5$ nm high and $5$ nm in radius.
• Each prism is $5$ nm high with an equilateral triangular base, whose side length is equal to $10$ nm.
• There is no interference between the waves scattered by these particles. The distribution is therefore diluted.
• The incident neutron beam is characterized by a wavelength of $1$ $\unicode{x212B}$.
• The incident angles are $\alpha_i = 0.2 ^{\circ}$ and $\varphi_i = 0^{\circ}$.
• The simulation is performed using the Distorted Wave Born Approximation (due to the presence of a substrate).
  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61  #!/usr/bin/env python3 """ Mixture of cylinders and prisms without interference """ import bornagain as ba from bornagain import deg, nm def get_sample(): """ Returns a sample with uncorrelated cylinders and prisms on a substrate. """ # Define materials material_Particle = ba.HomogeneousMaterial("Particle", 0.0006, 2e-08) material_Substrate = ba.HomogeneousMaterial("Substrate", 6e-06, 2e-08) material_Vacuum = ba.HomogeneousMaterial("Vacuum", 0, 0) # Define form factors ff_1 = ba.FormFactorCylinder(5*nm, 5*nm) ff_2 = ba.FormFactorPrism3(10*nm, 5*nm) # Define particles particle_1 = ba.Particle(material_Particle, ff_1) particle_2 = ba.Particle(material_Particle, ff_2) # Define interference functions iff = ba.InterferenceFunctionNone() # Define particle layouts layout = ba.ParticleLayout() layout.addParticle(particle_1, 0.5) layout.addParticle(particle_2, 0.5) layout.setInterferenceFunction(iff) layout.setTotalParticleSurfaceDensity(0.01) # Define layers layer_1 = ba.Layer(material_Vacuum) layer_1.addLayout(layout) layer_2 = ba.Layer(material_Substrate) # Define sample sample = ba.MultiLayer() sample.addLayer(layer_1) sample.addLayer(layer_2) return sample def get_simulation(sample): beam = ba.Beam(1, 0.1*nm, ba.Direction(0.2*deg, 0)) detector = ba.SphericalDetector(100, 2*deg, 0, 1*deg) simulation = ba.GISASSimulation(beam, sample, detector) return simulation if __name__ == '__main__': import ba_plot sample = get_sample() simulation = get_simulation(sample) ba_plot.run_and_plot(simulation) 
CylindersAndPrisms.py