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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Sample/Aggregate/InterferenceHardDisk.h
//! @brief Defines class InterferenceHardDisk.
//!
//! @homepage http://www.bornagainproject.org
//! @license GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
// ************************************************************************************************
#ifndef BORNAGAIN_SAMPLE_AGGREGATE_INTERFERENCEHARDDISK_H
#define BORNAGAIN_SAMPLE_AGGREGATE_INTERFERENCEHARDDISK_H
#include "Sample/Aggregate/IInterference.h"
//! Percus-Yevick hard disk interference function.
//!
//! M.S. Ripoll & C.F. Tejero (1995) Approximate analytical expression for the direct correlation
//! function of hard discs within the Percus-Yevick equation, Molecular Physics, 85:2, 423-428,
//! DOI: 10.1080/00268979500101211
class InterferenceHardDisk : public IInterference {
public:
InterferenceHardDisk(double radius, double density, double position_var = 0);
~InterferenceHardDisk() override = default;
std::vector<ParaMeta> parDefs() const final
{
return {{"Radius", "nm"}, {"Density", "nm^-2"}, {"Variance", "nm?"}};
}
#ifndef SWIG
InterferenceHardDisk* clone() const override;
#endif // SWIG
std::string className() const final { return "InterferenceHardDisk"; }
double particleDensity() const override { return m_density; }
double radius() const { return m_radius; }
double density() const { return m_density; }
std::string validate() const override;
private:
double iff_without_dw(const R3& q) const override;
double packingRatio() const;
double m_radius;
double m_density;
};
#endif // BORNAGAIN_SAMPLE_AGGREGATE_INTERFERENCEHARDDISK_H
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