Define ion such as 12C4+

Dear Geant4 users,
I am having trouble defining the ion such as 12C4+ (Z=6, A=12, charge=4).
It seems that G4Ions automatically calculate the charge as Z*eplus.
Is there any way to define Z and charge separately?
Thanks a lot in advance!

If you are using macro commands with G4ParticleGun, then

/gun/ion <Z> <A> <Q>

should do what you want. If you are using G4GeneralParticleSource, then

/gps/ion <Z> <A> <Q>

is the equivalent. If you are looking at secondary ions produced as part of an event, then yes, Geant4 assumes that charged ions collect however many electrons they need from the surrounding material to neutralize themselves.