G4H2O.cc

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// Author: Mathieu Karamitors 
//
// History:
// -----------
// 10 Oct 2011 M.Karamitros created
//
// -------------------------------------------------------------------

#include "G4H2O.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4ParticleTable.hh"

G4H2O* G4H2O::fgpInstance = nullptr;

G4H2O* G4H2O::Definition()
{
    if (fgpInstance != nullptr)
    {
        return fgpInstance;
    }

    const G4String name = "H2O";
    G4ParticleTable* pTable = G4ParticleTable::GetParticleTable();
    G4ParticleDefinition* pInstance = pTable->FindParticle(name);

    if (pInstance == nullptr)
    {
        const G4String formatedName = "H_{2}O";

        G4double mass = 18.0153 * g / Avogadro * c_squared;
        pInstance = new G4MoleculeDefinition(name,
                                              mass,
                                              2e-5 * (cm * cm / s), // diffusion coefficient
                                              0, // charge
                                              8, // electronic levels
                                              2.75 * angstrom, // radius
                                              3, // atoms number
                                              0 // lifetime
        ); //picosecond set in dissociation process

        ((G4MoleculeDefinition*) pInstance)->SetLevelOccupation(0);
        ((G4MoleculeDefinition*) pInstance)->SetLevelOccupation(1);
        ((G4MoleculeDefinition*) pInstance)->SetLevelOccupation(2);
        ((G4MoleculeDefinition*) pInstance)->SetLevelOccupation(3);
        ((G4MoleculeDefinition*) pInstance)->SetLevelOccupation(4);
        ((G4MoleculeDefinition*) pInstance)->SetFormatedName(formatedName);

    }
    fgpInstance = reinterpret_cast<G4H2O*>(pInstance);
    return fgpInstance;
}

G4H2O* G4H2O::DefinitionIfExists()
{
    return fgpInstance;
}