Interaction between a photon or an electron in a material at around 100 eV

Physics Processes, Models and Cross Sections
1

Dear experts, Sorry for my beginner question.
I’d like to simulate photon and electron interactions in a material arising from energy of 100eV level (corresponding to EUV level).

I made the B4d detector two-layered (assuming a semiconductor chip, where each thicknesses are 100nm) and added low-energy interactions by copying and pasting the PhysicsList from TestEm0 as follows (other settings are default).

<<<<< exampleB4d.cc >>>>>

auto detConstruction = new B4dDetectorConstruction();
runManager->SetUserInitialization(detConstruction);

auto physicsList = new FTFP_BERT;
physicsList->ReplacePhysics(new G4EmPenelopePhysics()); // or G4EmLivermorePhysics
runManager->SetUserInitialization(physicsList);

auto em = G4EmParameters::Instance();
em->SetMinEnergy(1eV);
em->SetLowestElectronEnergy(1eV);
em->SetMaxEnergy(1*MeV);
em->SetVerbose(1);

<<<<< B4dDetectorConstruction.cc >>>>>

auto cuts = new G4ProductionCuts();
cuts->SetProductionCut(1nm, G4ProductionCuts::GetIndex(“gamma”));
cuts->SetProductionCut(1nm, G4ProductionCuts::GetIndex(“e-”));
cuts->SetProductionCut(1*nm, G4ProductionCuts::GetIndex(“e+”));
auto detRegion = new G4Region(“Chip”);
detRegion->AddRootLogicalVolume(calorLV);
detRegion->SetProductionCuts(cuts);

//// Always return the physical World //
return worldPV;

However, even when injecting 100eV photons or electrons, no interaction (energy loss) occurred in the material (it just freezes).

FTFP_BERT works actually…

I have no idea which part is insufficient for my purpose? If there are any settings I should check, please let me know.

Geant4 Version: geant4-v10.5.0

2

Do youn know if there are any exsamples to simulate 1~100eV photon, electron intaractions?

3

What physics are you looking for in this energy range? EM, scintillation, etc.? I have never used it myself but probably you can get a lot of insight from looking at the microelectronics example which advertises that it is valid all the way down to 5 eV for electrons. There is also the PIXE_XRF example for x-ray emission and the scintillation example for light transport.

4

thanks for the kind comment

my interset is interactions via EUV, such as how many secondary electrons generate, how much those low energy electrons can pass in materials. So, my interest energy range is roughly 1 ~ 100 eV. If there is a good example handling such low energy pysics interactions, please tell me…

5

With five or more particles colliding the entire process might be different than for two particles… maybe there is not much you can learn from two particles anyways