توانِ بازدارندۀ‌ گازِ الکترونی دوبعدی برای خوشۀ‌ دویونیدر سرعت‌های بالا

نویسندگان

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


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
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