Master’s Discussion
College of Science for Women / University of Baghdad examined the thesis entitled ) Study the ion-dielectric interactions by particles tracks in matter(of the student Mays Adnan Taha.
The study investigated the effect of stopping power and energy loss using targets of aluminum (Al), copper (Cu), and the compound(Bi₀.₂₁Sb₀.₇₉)₂Te₃.
- In the present work, the energy loss function (ELF), wake potential, and stopping power of a proton interacting with thin-film samples of aluminum and copper were studied. The harmonic oscillator atom model was employed based on the linear response theory of the electronic dielectric function.
- In this section, individual elements were examined and their energy loss function (ELF) was calculated at momentum values k = 0. The Drude function was adopted and modeled using Wolfram Mathematica 13.2, applying the atomic unit system to facilitate numerical calculations and integrations. The obtained results were compared with available experimental energy loss data for aluminum and copper. In addition, the wake potential and induced potential of a proton interacting with aluminum and copper were calculated, as well as the stopping power.
- In the second part, the energy loss function of NaCl and the bismuth–antimony telluride alloy (Bi₀.₂₁Sb₀.₇₉)₂Te₃ was studied using two types of dielectric functions: the Drude–Lorentz model and the approximate plasmon-pole model. The concept of nuclear charge density was incorporated into the calculation of the wake potential and stopping power for the mentioned compounds.
- Three dielectric function models were considered: The Drude dielectric function, used to describe the energy loss function of copper and aluminum and compared with theoretical results, followed by the calculation of the induced potential and electronic stopping power.
The Drude–Lorentz dielectric function and The approximate plasmon-pole dielectric function.
The most important recommendations which the study has come up with and the average obtained:
-1 Studying the wake potential and stopping power of compounds such as Cd₅₀S₅₀₋ₓSeₓ and hafnium oxide graphene (HfO₂).
-2 Investigating the effect of selecting an appropriate plasmon dispersion relation p(k) and comparing the practical results.
-3Expanding the study of wake potential and stopping power to include projectiles composed of multi-atomic and multi-nuclear ion clusters such as CO₂ and C₆₀.
-4Using the SRIM program to analyze radiation-induced damage in materials and compounds.
the average obtained: Very Good
