I have generated a depletion_results.h5 output file and I would like to know if there is a way to obtain the concentrations of all nuclides in the file. I have been using results.get_atoms() to obtain these results, but this requires the user to specify the nuclide of interest. I imagine there are scenarios where the user may not even know what nuclides have been produced from the simulation.
Try to use results.export_to_materials(burnup_index=)
and I think this discussion topic could help you