source: sasview/sansmodels/src/sans/models/c_extensions/binaryHS.h @ e2f7b92

#if !defined(binaryHS_h)
#define binaryHS_h

/**
 * Structure definition for binary hard sphere parameters

        [PYTHONCLASS] = BinaryHSModel
        [DISP_PARAMS] = l_radius,s_radius
        [DESCRIPTION] =<text> Model parameters: l_radius : large radius of binary hard sphere
                        s_radius : small radius of binary hard sphere
                        vol_frac_ls : volume fraction of large spheres
                        vol_frac_ss : volume fraction of small spheres
                        ls_sld: large sphere  scattering length density
                        ss_sld: small sphere scattering length density
                        solvent_sld: solvent scattering length density
                        background: incoherent background
               </text>
        [FIXED]= l_radius.width;s_radius.width
        [ORIENTATION_PARAMS]= <text> </text>
 */
typedef struct {

        ///     large radius of the binary hard sphere [A]
    //  [DEFAULT]=l_radius= 100.0 [A]
    double l_radius;

    /// small radius of the binary hard sphere [A]
    //  [DEFAULT]=s_radius= 25.0 [A]
    double s_radius;

        ///     volume fraction of large spheres
    //  [DEFAULT]=vol_frac_ls= 0.1
    double vol_frac_ls;

        ///     volume fraction of small spheres
    //  [DEFAULT]=vol_frac_ss= 0.2
    double vol_frac_ss;

        ///     large sphere scattering length density [1/A^(2)]
    //  [DEFAULT]=ls_sld= 3.5e-6 [1/A^{2}]
    double ls_sld;

        ///     lsmall sphere scattering length density [1/A^(2)]
    //  [DEFAULT]=ss_sld= 5e-7 [1/A^(2)]
    double ss_sld;

    /// solvent scattering length density [1/A^(2)]
    //  [DEFAULT]=solvent_sld= 6.36e-6 [1/A^(2)]
    double solvent_sld;

        /// Incoherent Background [1/cm]
        //  [DEFAULT]=background=0.001 [1/cm]
        double background;

} BinaryHSParameters;



/// 1D scattering function
double binaryHS_analytical_1D(BinaryHSParameters *pars, double q);

/// 2D scattering function
double binaryHS_analytical_2D(BinaryHSParameters *pars, double q, double phi);
double binaryHS_analytical_2DXY(BinaryHSParameters *pars, double qx, double qy);

#endif