## Particle composition example

In this example it is modelled a multi layer consisting of a substrate layer and an air layer. Cylindrical particles made of two materials are added to the air layer and their $z$ coordinate is shifted downwards in order to cross the air-substrate interface.

  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 62 63 64 65 66 67 68  #!/usr/bin/env python3 """ Cylindrical particle made from two materials. Particle crosses air/substrate interface. """ import bornagain as ba from bornagain import deg, nm, kvector_t def get_sample(): """ Returns a multi layer with substrate/air layers. Vacuum layer contains cylindrical particles made of two materials. Particle shifted down to cross interface. """ # Define materials material_Ag = ba.HomogeneousMaterial("Ag", 1.245e-05, 5.419e-07) material_Substrate = ba.HomogeneousMaterial("Substrate", 3.212e-06, 3.244e-08) material_Teflon = ba.HomogeneousMaterial("Teflon", 2.9e-06, 6.019e-09) material_Vacuum = ba.HomogeneousMaterial("Vacuum", 0, 0) # Define form factors ff_1 = ba.FormFactorCylinder(10*nm, 4*nm) ff_2 = ba.FormFactorCylinder(10*nm, 10*nm) # Define particles subparticle_1 = ba.Particle(material_Ag, ff_1) subparticle_1.setPosition(kvector_t(0, 0, 10*nm)) subparticle_2 = ba.Particle(material_Teflon, ff_2) # Define composition of particles at specific positions particle = ba.ParticleComposition() particle.addParticle(subparticle_1) particle.addParticle(subparticle_2) particle.setPosition(kvector_t(0, 0, -10*nm)) # Define particle layouts layout = ba.ParticleLayout() layout.addParticle(particle) layout.setTotalParticleSurfaceDensity(1) # 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(1e9, 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) 
BiMaterialCylinders.py