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توانِ بازدارندۀ گازِ الکترونی دوبعدی برای خوشۀ دویونیدر سرعتهای بالا | ||
فیزیک کاربردی ایران | ||
مقاله 1، دوره 4، شماره 1، تیر 1393، صفحه 69-81 اصل مقاله (638.99 K) | ||
شناسه دیجیتال (DOI): 10.22051/jap.2015.1207 | ||
نویسندگان | ||
ترانه وظیفه شناس؛ سمیرا صابری پویا* | ||
چکیده | ||
در این مقاله ما توانِ بازدارندۀ گازِ الکترونی دوبعدی برای خوشۀ دویونی را برپایۀ فرمولبندی تابعِ دیالکتریک، در حدِّ سرعتها و دماهای بالا، محاسبه کردهایم. در به دست آوردن تابعِ دیالکتریک از روشِ گشتاورها که اثراتِ همبستگی نیز در آن گنجانده شده، استفاده نمودهایم و براساسِ آن توانِ بازدارنده را برحسبِ فاصلۀ بین دو یون برای مقادیرِ مختلفِ ضریبِ جفتشدگی، پارامترِ تبهگنی و سرعتِ پرتابه به دست آوردهایم. نتایج نشان میدهند که با کاهشِ ضریبِ جفتشدگی و یا افزایش پارامترِ تبهگنی، نوساناتِ فریدل در فواصلِ بین یونی کوتاهتر ظاهر میشوند و در سرعتهای بالاتر این رفتار نوسانی، به سرعت میرا میشود. همچنین مشاهده میشود که توانِ بازدارندۀ سیستم با سرعتِ خوشۀ دویونی، رابطۀ عکس دارد. | ||
کلیدواژهها | ||
توانِ بازدارنده؛ خوشۀ دویونی؛ روشِ گشتاورها؛ سرعتِ بالا؛ پارامترِ تبهگنی؛ نوساناتِ فریدل | ||
عنوان مقاله [English] | ||
Dicluster stopping power of a two-dimensionalelectron gas at high velocities | ||
نویسندگان [English] | ||
Taraneh Vazifeshenas؛ Samira Saberipouya | ||
چکیده [English] | ||
In this paper, we calculate the dicluster stopping power of a two dimensional electron gas based on the dielectric function formalism at high velocities and temperatures. The dielectric function is derived by using the method of moments in which the effects of correlation have been included, and from that we obtain the dicluster stopping power in terms of the inter-ion spacing for different values of coupling coefficient, degeneracy parameter and velocity of projectile. The results show that with decreasing the coupling coefficient or increasing the degeneracy parameter, the Friedel oscillations appear at shorter inter-ion distances and quickly damped at higher velocities. Also, it is found out that the stopping power of the system is proportional to the inverse of the dicluster's velocity. | ||
کلیدواژهها [English] | ||
Stopping power, Dicluster, Method of moments, High velocity, Degeneracy parameter, Friedel oscillations | ||
مراجع | ||
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