## Baisc off-specular scattering example

Class reference: OffspecSimulation.

#### Example

Off-specular scattering from a monodisperse distribution of long boxes.

• The sample is made of very long boxes with length equal to $1000$ nm, width $20$ nm and height $10$ nm.
• The particles are distributed along a one-dimensional lattice with a lattice spacing of $100$ nm in the $x$-direction.
• The particles are rotated around the $z$-axis by $90^{\circ}$ so that their “infinite” dimension is parallel to the $y$-direction.
• The incident wavelength is equal to 0.1 nm.
• The output intensity is the result of an average over $\varphi_i$ comprised between $-1^{\circ}$ and $1^{\circ}$ and of a scan of $\alpha_i$ and $\alpha_f$ between $0^{\circ}$ and $10^{\circ}$.

The two-dimensional output intensity is plotted as a function of $\alpha_i$ and $\alpha_f$.

  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  #!/usr/bin/env python3 """ Basic offspec example. Sample is a grating on a substrate, modelled by a 1d lattice of long boxes """ import bornagain as ba from bornagain import ba_plot as bp, deg, nm import matplotlib.pyplot as plt def get_sample(): # Materials material_particle = ba.RefractiveMaterial("Particle", 0.0006, 2e-08) material_substrate = ba.RefractiveMaterial("Substrate", 6e-06, 2e-08) vacuum = ba.RefractiveMaterial("Vacuum", 0, 0) # Particles ff = ba.Box(1000*nm, 20*nm, 10*nm) particle = ba.Particle(material_particle, ff) particle_rotation = ba.RotationZ(90*deg) particle.rotate(particle_rotation) # Interference functions iff = ba.Interference1DLattice(100*nm, 0) iff_pdf = ba.Profile1DCauchy(1e6*nm) iff.setDecayFunction(iff_pdf) # Particle layouts layout = ba.ParticleLayout() layout.addParticle(particle) layout.setInterference(iff) layout.setTotalParticleSurfaceDensity(0.01) # Layers layer_1 = ba.Layer(vacuum) layer_1.addLayout(layout) layer_2 = ba.Layer(material_substrate) # Sample sample = ba.MultiLayer() sample.addLayer(layer_1) sample.addLayer(layer_2) return sample def get_simulation(sample): nscan = 200 ny = 50 scan = ba.AlphaScan(nscan, 0.1*deg, 10*deg) scan.setIntensity(1e9) scan.setWavelength(0.1*nm) detector = ba.OffspecDetector(ny, -1*deg, +1*deg, nscan, 0.1*deg, 10*deg) return ba.OffspecSimulation(scan, sample, detector) if __name__ == '__main__': bp.parse_args(intensity_min=1) sample = get_sample() simulation = get_simulation(sample) result = simulation.simulate() bp.plot_simulation_result(result) plt.show() 
auto/Examples/offspec/Offspec1.py