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