Abstract
The electronic stopping losses for p–He and p–Ar systems are compared with independent measurements of cross sections for elementary processes. It is shown that quantitative agreement can be reached if the fact that significant energy losses are carried away by knocked-out electrons is taken into account. The dependence of the average energy of knocked-out electrons on the impact velocity for velocities that are smaller than 1.5 a.u. can be described within the framework of dynamic ionization theory. It is established that the equilibrium charge of beam particles depends on the ratio of the stripping and charge-exchange cross sections, and the use of frequently applied universal models for description of the equilibrium charge in the case under consideration is not justified. It is shown that the contribution of excitation processes for the studied cases does not exceed 7–12%, which differs from traditional concepts of equality between the contributions of ionization and excitation processes. The inclusion of multiple ionization processes, which increases the electronic stopping power by 6% in the case of p–He and by 23% in the case of p–Ar, turns out to be important.
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ACKNOWLEDGMENTS
We are grateful to Alexei Alexeevich Basalaev (Ioffe Physical–Technical Institute) for useful discussions.
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Zinoviev, A.N., Babenko, P.Y. Contribution of Elementary Processes to the Electronic Stopping Power during Atomic Collisions. J. Surf. Investig. 15, 623–636 (2021). https://doi.org/10.1134/S1027451021030368
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DOI: https://doi.org/10.1134/S1027451021030368