G4Hydrogen.cc

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

#include "G4Hydrogen.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4ParticleTable.hh"

// ######################################################################
// ###                         Hydrogen                               ###
// ######################################################################
G4Hydrogen* G4Hydrogen::theInstance = 0;

G4Hydrogen* G4Hydrogen::Definition()
{
  if (theInstance != 0) return theInstance;
  const G4String name = "H";
  // search in particle table]
  G4ParticleTable* pTable = G4ParticleTable::GetParticleTable();
  G4ParticleDefinition* anInstance = pTable->FindParticle(name);
  if (anInstance == 0)
  {
    // 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 = 1.0079 * g / Avogadro * c_squared;
    anInstance = new G4MoleculeDefinition(name, mass, 7e-9 * (m * m / s), 0, // charge
                                          1, // number of occupancies
                                          0.5 * angstrom); //radius has to be checked

    ((G4MoleculeDefinition*) anInstance)->SetLevelOccupation(0, 1);
    ((G4MoleculeDefinition*) anInstance)->SetFormatedName("H");
  }
  theInstance = reinterpret_cast<G4Hydrogen*>(anInstance);
  return theInstance;
}