source: sasview/sansmodels/src/sans/models/c_extensions/SquareWell.h @ 1aaa579

#if !defined(SquareWell_h)
#define SquareWell_h

/**Structure definition for SquareWell parameters
*/
//   [PYTHONCLASS] = SquareWellStructure
//   [DISP_PARAMS] = effect_radius
//   [DESCRIPTION] = <text> Structure Factor for interacting particles:             .
//
//  The interaction potential is
//
//              U(r)= inf   , r < 2R
//                      = -d    , 2R <= r <=2Rw
//                      = 0     , r >= 2Rw
//
//              R: effective radius (A)of the particle
//              v: volume fraction
//              d: well depth
//              w: well width; multiples of the
//              particle diameter
//
//              Ref: Sharma, R. V.; Sharma,
//      K. C., Physica, 1977, 89A, 213.
//                      </text>
//   [FIXED]= effect_radius.width
//[ORIENTATION_PARAMS]= <text> </text>


typedef struct {
    /// effective radius of particle [A]
    //  [DEFAULT]=effect_radius=50.0 [A]
    double effect_radius;

    /// Volume fraction
    //  [DEFAULT]=volfraction= 0.040
    double volfraction;

    /// Well depth [kT]
    //  [DEFAULT]=welldepth= 1.50 [kT]
    double welldepth;

    /// Well width
    //  [DEFAULT]=wellwidth= 1.20
    double wellwidth;

} SquareWellParameters;



/// 1D scattering function
double SquareWell_analytical_1D(SquareWellParameters *pars, double q);

/// 2D scattering function
double SquareWell_analytical_2D(SquareWellParameters *pars, double q, double phi);
double SquareWell_analytical_2DXY(SquareWellParameters *pars, double qx, double qy);

#endif