How to define H- ions in Geant4 with GPS or G4ParticleGun

Particles, Track, Event, Run and Biasing
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_Geant4 Version:v11.3
_Operating System: Ubuntu 22.04
_Compiler/Version:gcc
_CMake Version: cmake
Hi experts,
—I want define H-(hydrogen atom with an e-) with G4GeneralParticleSource,

/gps/particle ion
/gps/ion 1 1 -1

I configured an ion source as described above using Geant4, but during runtime, G4 displays protons instead of my defined ions. Could there be limitations in G4’s ion definition capability? (Note: When attempting to define H- ions through the G4ParticleDefinition class, G4 indicates this ion has already been predefined.)

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What do you mean by “displays”? Do you mean the particle name string? Since the proton is a specifically defined particle type (G4Proton) it has a name string and that’s what gets printed out. Strings like “Ge72[0.0]” are generated on the fly when a particular heavy ion is requested.

If you’re worried about the charge state, that’s not a separate particle type, and is not pare of the particle name string. The instantaneous charge for ions is a property of G4DynamicParticle, which is owned by G4Track.

3

Thank you for your help, it’s a good idea for me to solve my problem.

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