source: sasview/sansmodels/include/lamellarPS.h @ 503a972

/*
        TODO: Add 2D model
 */

#if !defined(lamellarPS_h)
#define lamellarPS_h
#include "parameters.hh"

/** Structure definition for concentrated lamellar form factor parameters
 * [PYTHONCLASS] = LamellarPSModel
 * [DISP_PARAMS] = delta, spacing
   [DESCRIPTION] = <text>[Concentrated Lamellar Form Factor] Calculates the scattered
           intensity from a lyotropic lamellar phase.
           The intensity (form factor and structure
           factor)calculated is for lamellae of
           uniform scattering length density that
           are randomly distributed in solution
           (a powder average). The lamellae thickness
                is polydisperse. The model can also
                be applied to large, multi-lamellar vesicles.
                No resolution smeared version is included
                in the structure factor of this model.
 *Parameters: spacing = repeat spacing,
                delta = bilayer thickness,
                sld_bi = SLD_bilayer
                sld_sol = SLD_solvent
                n_plate = # of Lamellar plates
                caille = Caille parameter (<0.8 or <1)
                background = incoherent bgd
                scale = scale factor
</text>
   [FIXED]= <text>delta.width; spacing.width</text>
   [ORIENTATION_PARAMS]=

 **/

class LamellarPSModel{
public:
  // Model parameters
  /// Scale factor
  //  [DEFAULT]=scale=1.0
  Parameter scale;
  /// repeat spacing of the lamellar [A]
  //  [DEFAULT]=spacing=400 [A]
  Parameter spacing;
  /// bilayer thicknes [A]
  //  [DEFAULT]=delta=30 [A]
  Parameter delta;
  /// SLD of bilayer [1/A^(2)]
  //  [DEFAULT]=sld_bi=6.3e-6 [1/A^(2)]
  Parameter sld_bi;
  /// SLD of solvent [1/A^(2)]
  //  [DEFAULT]=sld_sol=1.0e-6 [1/A^(2)]
  Parameter sld_sol;
  /// Number of lamellar plates
  //  [DEFAULT]=n_plates=20
  Parameter n_plates;
  /// caille parameters
  //  [DEFAULT]=caille=0.1
  Parameter caille;
  /// Incoherent Background [1/cm]
  //  [DEFAULT]=background=0.0 [1/cm]
  Parameter background;
  // Constructor
  LamellarPSModel();

  // Operators to get I(Q)
  double operator()(double q);
  double operator()(double qx, double qy);
  double calculate_ER();
  double evaluate_rphi(double q, double phi);
};

#endif