Detector Resolution Function

Scattering from a monodisperse distribution of cylindrical particles with a Gaussian resolution function of the detectors.

  • The sample is made of cylindrical particles randomly deposited on a substrate. It is similar to Cylinders in DWBA with the additional resolution function of the detectors.
  • The radii and heights of the cylinders are equal to 5 nm.
  • There is no interference between the scattered waves.
  • The detector resolution function is a two-dimensional Gaussian with the same width for the x- and y-axis: σx = σy= 0.0025°.
  • The wavelength is equal to 1 Å.
  • The incident angles are αi=0.2° and Φi=0°.

 

Intensity Image: 
Python Script: 
"""
Cylinder form factor in DWBA with detector resolution function applied
"""
import numpy
import bornagain as ba
from bornagain import deg, angstrom, nm

phi_min, phi_max = 0.0, 2.0
alpha_min, alpha_max = 0.0, 2.0


def get_sample():
    """
    Returns a sample with uncorrelated cylinders on a substrate.
    """
    # defining materials
    m_ambience = ba.HomogeneousMaterial("Air", 0.0, 0.0)
    m_substrate = ba.HomogeneousMaterial("Substrate", 6e-6, 2e-8)
    m_particle = ba.HomogeneousMaterial("Particle", 6e-4, 2e-8)

    # collection of particles
    cylinder_ff = ba.FormFactorCylinder(5*nm, 5*nm)
    cylinder = ba.Particle(m_particle, cylinder_ff)
    particle_layout = ba.ParticleLayout()
    particle_layout.addParticle(cylinder, 1.0)

    # assembling the sample
    air_layer = ba.Layer(m_ambience)
    air_layer.addLayout(particle_layout)
    substrate_layer = ba.Layer(m_substrate)

    multi_layer = ba.MultiLayer()
    multi_layer.addLayer(air_layer)
    multi_layer.addLayer(substrate_layer)
    return multi_layer


def get_simulation():
    """
    Returns a GISAXS simulation with detector resolution function defined.
    """
    simulation = ba.GISASSimulation()
    simulation.setDetectorParameters(100, phi_min*deg, phi_max*deg,
                                     100, alpha_min*deg, alpha_max*deg)
    simulation.setBeamParameters(1.0*angstrom, 0.2*deg, 0.0*deg)
    simulation.setDetectorResolutionFunction(
        ba.ResolutionFunction2DGaussian(0.0025, 0.0025))
    return simulation


def run_simulation():
    """
    Runs simulation and returns intensity map.
    """
    sample = get_sample()
    simulation = get_simulation()
    simulation.setSample(sample)
    simulation.runSimulation()
    return simulation.getIntensityData()


if __name__ == '__main__':
    result = run_simulation()
    ba.plot_intensity_data(result)