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عدد الالكترونات المؤثرة ل DNA والماء السائل == Effective Number of Electron of DNA and Liquid Water
اسم المؤلف:
احمد محمد عبد الاسدي
اسم المشرف:
خالد عبد الوهاب احمد
الموضوع العام:
علوم الفيزياء
السنة:
2015
الموضوع الدقيق:
فيزياء الالكترونيات
الدرجة:
ماجستير
الجامعة:
الجامعة المستنصرية - كلية التربية للعلوم الصرفة
اللغة:
الانكليزية
مكان الجامعة:
بغداد
الصفحات الاولى:
📎 26T1781 - p.pdf
المستخلص:
The effective number of electrons for DNA and liquid water which is a function to the energy that contributes in the excitations of the target using the dielectric formalism was calculated in present work and we found the maximum value of (???????????????? ≈ 205) for DNA and (???????????????? ≈ 6) for ????2???? when the transferred energy is about 100 ????????. The electronic response of DNA and liquid water is described by the MELF - GOS model, in which the outer electron excitations of the target are accounted by Mermin - type energy loss function, whereas the inner - shell electron excitations are modeled by the generalized oscillator strengths of the constituent atoms. The probability of energy loss per unit path length has been calculated as a function of charge fraction (q) (ionization fraction) at different incident protons energy (T???? = 0.05 , 0.25 , 1 , 2 , 2.5 MeV/u) for DNA and liquid water. Also the partial stopping power effective charge ????(????) (PSPEC), stopping cross - section ????(????), the average energy transferred E (T) which found for DNA at highest energy ≈ 76.5 eV and for liquid water ≈ 75 ????????, and the mean ionization potential ????(????) were calculated and we obtained (???? ≈ 80 ????????) for DNA and (???? ≈ 79 ????????) for ????2???? when (ħ???? → ∞). Good agreement achieved with a previous work. The mathematical equations have been programmed by writing a Fortran - 90 program for numerical calculations.
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