G4H2O.cc

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// $Id: G4H2O.cc 85244 2014-10-27 08:24:13Z gcosmo $
//
// Author: Mathieu Karamitors 
//
// History:
// -----------
// 10 Oct 2011 M.Karamitros created
//
// -------------------------------------------------------------------

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

// ######################################################################
// ###                         Hydrogen                               ###
// ######################################################################
G4H2O* G4H2O::theInstance = 0;

G4H2O* G4H2O::Definition()
{
  if (theInstance != 0) return theInstance;

  const G4String name = "H2O";
  // search in particle table]
  G4ParticleTable* pTable = G4ParticleTable::GetParticleTable();
  G4ParticleDefinition* anInstance = pTable->FindParticle(name);

  if (anInstance == 0)
  {
    const G4String formatedName = "H_{2}O";

    // create molecule
    //
    //      G4MoleculeDefinition(const G4String& name,
    //          G4double mass,
    //          G4double diffCoeff,
    //          G4int    charge = 0,
    //          G4int    electronicLevels = 0,
    //          G4double radius = -1,
    //          G4int    atomsNumber = -1,
    //          G4double lifetime = -1,
    //          G4String aType = "",
    //          G4FakeParticleID ID = G4FakeParticleID::Create()
    //      );

    G4double mass = 18.0153 * g / Avogadro * c_squared;
    anInstance = new G4MoleculeDefinition(name, mass, 2e-5 * (cm * cm / s),
                                          0, // charge
                                          8, 2.75 * angstrom, 3,
                                          0 /*lifetime*/); //picosecond set in dissociation process

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

  }
  theInstance = reinterpret_cast<G4H2O*>(anInstance);
  return theInstance;
}