Modified El-Hoshy−Gibbons model for electronic stopping cross sections in Si and SiC for low-velocity ions with atomic numbers between 5 and 15

The El-Hoshy−Gibbons model, which reduces not only the atomic numbers of projectiles (Z1) and targets but also the impact parameter for small-angle collisions (R0) in the Firsov model, was modified based on the relation between R0 and the Kohn−Sham radii of projectiles (rKS); namely, the reduction factor y of R0 was chosen to be 10 when R0 was larger rKS and 5 in the case R0 ≤ rKS. This modification improved the reproducibility of the periodic dependences of the electronic stopping cross sections in Si, as well as those in SiC, for low-velocity ions with 5 ≤ Z1 ≤ 15.