A flexible and upgradable parametrization of the electronic stopping cross section

The stopping cross section describes the characteristic energy loss of fast propagating ions in matter, knowledge of which is important for applications like ion implantation, ion beam analysis, or radiation therapy. When the propagating ions have energies between around 10 keV/u and 10 MeV/u, the energy loss is dominated by the energy transfer to the electrons in the target. In this work we propose to parametrically describe the electronic stopping cross section by using the double-Konac (dK) expression. We present parameter sets for this mathematical model that allow the reproduction of the stopping cross sections of the PSTAR and ASTAR tabulations, of SRIM-2003, and of the ESPNN implementation. In addition, we present parameter sets which account for the experimental data that are published until 2025. We present a parameter set for targets in the gas phase and one for targets in the solid phase.