particle : PBEparticle = {
    FractalIndex = 1.6,
    Bondforce = 46e-9,
    Density = 2700.0,
    RefractiveIndex = 1.622,
    UVabsorption = (2.279e15, 3.022e15),
    SurfacePotential = 0.00,
    SurfaceCharge = 0.005,
    RPermittivity = 2.26,
    AvgRadius = 0.405e-6
}