Nuclear stopping cross-section

Fig. 8. Stopping cross section for He+ projectiles colliding with atomic neon. Continuum line total stopping cross section long-dashed line nuclear stopping cross section short-dashed line electronic stopping cross section. The experimental data are [52] O, [53] [54]. Also for comparison we show the total calculated cross section for He + ions colliding with atomic neon (dotted line).

In (5.3) we defined the stopping cross-section. The nuclear stopping cross-section for an ion of energy E is given by... 

Equation (5.12) is the high-energy reduced nuclear stopping cross-section for unscreened (Coulomb) nuclear stopping. Figure 5.2 shows that the reduced nuclear stopping cross-section is identical for all screening functions for s > 10. However, considerable differences exist for lower values of s. 

A fully stripped, high-energy ion can also transfer energy to the nuclei of the solid as well as to target electrons. From Fig. 5.3, we see that the nuclear stopping cross-section is approximately equal to 10 3 Sa(t ) for ions with energies s > 30. To confirm this, one could calculate Sn(E) using (5.13). 

A power law-based estimate of the nuclear stopping cross-section, Sn(E), given in (5.7), results in an approximate expression for R, which is given by... 

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