LongBoxLorentz.cpp

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//  ************************************************************************************************
//
//  BornAgain: simulate and fit reflection and scattering
//
//! @file      Sample/HardParticle/LongBoxLorentz.cpp
//! @brief     Implements class LongBoxLorentz.
//!
//! @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)
//
//  ************************************************************************************************
 
#include "Sample/HardParticle/LongBoxLorentz.h"
#include "Base/Math/Functions.h"
#include "Sample/Shapes/BoxNet.h"
 
LongBoxLorentz::LongBoxLorentz(const std::vector<double> P)
    : IFormFactor(P)
    , m_length(m_P[0])
    , m_width(m_P[1])
    , m_height(m_P[2])
{
    checkNodeArgs();
    m_shape3D = std::make_unique<BoxNet>(m_length, m_width, m_height);
}
 
LongBoxLorentz::LongBoxLorentz(double length, double width, double height)
    : LongBoxLorentz(std::vector<double>{length, width, height})
{
}
 
complex_t LongBoxLorentz::formfactor_at_bottom(C3 q) const
{
    complex_t qxL2 = 2.5 * std::pow(m_length * q.x(), 2);
    complex_t qyWdiv2 = m_width * q.y() / 2.0;
    complex_t qzHdiv2 = m_height * q.z() / 2.0;
 
    return m_height * m_length * m_width * std::exp(complex_t(0., 1.) * qzHdiv2) / (1.0 + qxL2)
           * Math::sinc(qyWdiv2) * Math::sinc(qzHdiv2);
}