Lithium ion definiton in particlegun ?

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Geant4 version Name: geant4-09-02-beta-01

I am trying to shoot Lithium ion in the particlegun, but I can not find Li in G4ParticleTable.On the other hand, even if I see the Li ion in G4IonTable by GetIonName(Z,A,E), I can not use it in the particlegun. Am I missing something? Can anybody help me ?

#include "G4Event.hh"
#include "G4ParticleGun.hh"
#include "G4ParticleTable.hh"
#include "G4IonTable.hh"
#include "G4ParticleDefinition.hh"
#include "globals.hh"

void ExN01PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
// There is no Li in G4ParticleTable
  particleGun = new G4ParticleGun(n_particle);
  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
  particleGun->SetParticleDefinition(particleTable->FindIon(3,7,0));

// Neither I can use the Li in G4IonTable
  G4IonTable* ionTable ;
  G4cout<<ionTable->GetIonName(3, 7, 0.84*MeV)<<G4endl;; // Seems to work
  G4cout<<ionTable->GetNucleusEncoding(3, 7, 0.84*MeV)<<G4endl; // Seems to work
  G4ParticleDefinition* ion = ionTable->GetIon(3,7,0.84*MeV); 
  particleGun->SetParticleDefinition(ion);

  particleGun->SetParticleEnergy(0.84*MeV);    
  particleGun->SetParticlePosition(G4ThreeVector(0.0, 0.0, 0.0));    
  G4ThreeVector v(1.0,0.0,0.0);
  particleGun->SetParticleMomentumDirection(v);
  particleGun->GeneratePrimaryVertex(anEvent);
}