Particle-Matter Interactions
Use the Particle-Matter Interactions node to model the propagation of energetic ions through solid material. The Ionization Loss and Nuclear Stopping subnodes are available from the context menu (right-click the parent node) or from the Physics toolbar, Attributes menu. In order to model the interaction of particles with the target material, at least one subnode must be added.
Target Material Properties
By default, the Refractive index, real part n (dimensionless) is taken From material. For User defined enter another value or expression.
By default, the Density ρ (SI unit: kg/m2) is taken From material. For User defined enter another value or expression.
Enter a value or expression for the Atomic mass A (SI unit: kg). The default value is 28.0855 amu, the relative atomic mass of silicon. Then enter a value or expression for the Atomic number Zm (dimensionless). The default value is 14.
Particle Properties
Enter a value or expression for the Atomic number Zp (dimensionless). The default value is 1. The particle atomic number is used to define screened Coulomb potentials for the Nuclear Stopping node.
Cutoff Energy
Select the Stop particles with energy below cutoff to cause particles to stop moving when their energy is less than a specified value. This check box is selected by default. Then enter a value or expression for the Cutoff energy Ec (SI unit: J). The default value is 8.6 eV.
In general, the Stop particles with energy below cutoff check box should always be selected if it is possible for ions in the material to approach extremely low energies. With the built-in ionization loss and nuclear scattering models, accurate data is not available for energies significantly less than the default value, 8.6 eV.
Affected Particles
Use this section to determine which particles are subjected to the particle-matter interaction. By default, all particles in the model are affected. The settings are described for the Force node.