عنوان المقالة:ﺘﺼﻤﻴﻡ ﺍﻟﻌﺩﺴﺎﺕ ﺍﻟﻤﻐﻨﺎﻁﻴﺴﻴﺔ ﻭﺍﻟﻜﻬﺭﻭﺴﺘﺎﺘﻴﻜﻴﺔ ﺍﻟﺸﻴﺌﻴﺔ ﻟلحزم ﺫﺍﺕ ﺍﻟﻁﺎﻗﺎﺕ ﺍﻟﻤﺘﺩﻨﻴﺔ Design of the Objective Magnetic and Electrostatic Lenses for Low Beam Energies
نضال سعدي عبد حجازي | Nedhal Sadie Abd Hujazie | 10543
نوع النشر
مجلة علمية
المؤلفون بالعربي
منى عبد الكريم الخشاب و نضال سعدي حجازي
المؤلفون بالإنجليزي
Mona A. Al-Khashab and Nedhal S. Hujazie
الملخص العربي
ﺇﻥ ﺘﺼﻤﻴﻡ ﺍﻟﻌﺩﺴﺎﺕ ﺍﻟﻤﻐﻨﺎﻁﻴﺴﻴﺔ ﻭﺍﻟﻜﻬﺭﻭﺴﺘﺎﺘﻴﻜﻴﺔ ﺍﻟﺸﻴﺌﻴﺔ ﺍﻟﺘﻲ ﺘﻤﺘﻠﻙ ﻤﻌﺎﻤﻼﺕ ﺯﻴﻭﻍ ﻗﻠﻴﻠﺔ ﻋﻨﺩ ﺍﻟﻁﺎﻗﺎﺕ ﺍﻟﻤﺘﺩﻨﻴﺔ ﻴﻌﺘﺒﺭ ﻤﻥ ﺍﻟﻤﻭﺍﻀﻴﻊ ﺍﻟﺘﻲ ﺘﺤﻅﻰ ﺒﺎﻫﺘﻤﺎﻡ ﻜﺒﻴﺭ ﻓﻲ ﻤﺨﺘﻠﻑ ﻤﺠﺎﻻﺕ ﻤﻁﻴﺎﻓﻴﺔ ﺍﻹﻟﻜﺘﺭﻭﻥ. ﻴﺘﻀ ﻤﻥ ﺍﻟﺒﺤﺙ ﺍﻟﺤﺎﻟﻲ ﺩﺭﺍﺴﺎﺕ ﻤﻜﺜﻔﺔ ﻭﺤﺴﺎﺒﺎﺕ ﻟﻜﻼ ﺍﻟﻨﻭﻋﻴﻥ ﻤﻥ ﺍﻟﻌﺩﺴﺎﺕ ﺍﻻﻟﻜﺘﺭﻭﻨﻴﺔ)ﻭﺍﻟﻜﻬﺭﻭﺴﺘﺎﺘﻴﻜﻴﺔ ﺍﻟﻤﻐﻨﺎﻁﻴﺴﻴﺔ ( ﻟﻠﺤﺼﻭل ﻋﻠﻰ ﺃﻓﻀل ﺘﺼﻤﻴﻡ ﻟﻠﻌﺩﺴﺔ ﺍﻟﻤﺭﻜﺒﺔ. ﻟﻘﺩ ﺘﻡ ﺘﺼﻤﻴﻡ ﻋﺩﺴﺔ ﻤﻐﻨﺎﻁﻴﺴﻴﺔ ﻻ ﻤﺘﻨﺎﻅﺭﺓ ﺫﺍﺕ ﺸﻜل ﻫﻨﺩﺴﻲ ﻤﺨﺭﻭﻁﻲ . ﻜﻤﺎ ﺘﻡ ﺇﺠﺭﺍﺀ ﺩﺭﺍﺴﺎﺕ ﺃﺨﺭﻯ ﺘﻀﻤﻨﺕ ﻤﺠﻤﻭﻋﺔ ﻤﻥ ﺍﻟﻌﺩﺴﺎﺕ ﺍﻟﻜﻬﺭ ﻭﻤﺘﺤﺩﺘﻴ ﻭﺴﺘﺎﺘﻴﻜﻴﺔ ﺍﻟﻼﻤﺘﻨﺎﻅﺭﺓ ﻤﻜﻭﻨﺔ ﻤﻥ ﺍﺴﻁﻭﺍﻨﺘﻴﻥ ﻤﺘﺭﺍﻜﺒﺘﻴﻥ ﻥ ﻓﻲ ﺍﻟﻤﺤﻭﺭ ﻭﺫﺍﺕ ﺸﻜل ﻫﻨﺩﺴﻲ ﻤﺘﻐﻴﺭ ﻟﻘﻁﺒﻬﺎ ﺍﻟﺩﺍﺨﻠﻲ . ﻭﺠﺩ ﺃﻥ ﺍﻟﺸﻜل ﺍﻟﻬﻨﺩﺴﻲ ﻟﻠﻘﻁﺏ ﺍﻟﺨﺎﺭﺠﻲ ﺒﺎﻹﻀﺎﻓﺔ ﺇﻟﻰ ﻁﻭل ﻗﻁﺒﻬﺎ ﺍﻟﺩﺍﺨﻠﻲ ﻟﻬﻤﺎ ﺘﺄﺜﻴﺭ ﻭﺍﻀﺢ ﻋﻠﻰ ﺍﻟﺨﻭﺍﺹ ﺍﻟﺒﺼﺭﻴﺔ ﺍﻻﻟﻜﺘﺭ ﺍﻟﻌﺩﺴﺎﺕ ﻭﻨﻴﺔ ﻟﻤﺜل ﻫﺫﻩ .ﺃ ﻟﻘﺩ ﻟﻭﺤﻅ ﺨﺼ ﻥ ﺃﻓﻀل ﻓﺠﻭﺓ ﺎﺌﺹ ﺒﺼﺭﻴﺔ ﺍﻟﻜﺘﺭﻭﻨﻴﺔ ﺘﺤﻘﻘﺕ ﻋﻨﺩ ﻁﻭل )ﻭ (ﻟ .( ﻤﻠﻡ 5) ﻤﺴﺎﻭﻴﺎ ـ ﻟﻘﺩ ﺘﻤﺕ ﻤﻘﺎﺭﻨﺔ ﺍﻟﺨﻭﺍﺹ ﺍﻟﺒﺅﺭﻴﺔ ﻟﻠﻌﺩﺴﺎﺕ ﺍﻟﻤﻐﻨﺎﻁﻴﺴﻴﺔ ﻭﺍﻟﻜﻬﺭﻭﺴﺘﺎﺘﻴﻜﻴﺔ ﻷﻓﻀل ﺘﺼﻤﻴﻡ ﺘﻡ ﺍﻗﺘﺭﺍﺤﻪ ﻓﻲ ﺍﻟﺒﺤﺙ ﺍﻟﺤﺎﻟﻲ ﻭﺘﻤﺕ ﻤﻘﺎﺭﻨﺘﻪ ﻤﻊ ﻨﺘﺎﺌﺞ ﺍﻟﺒﺤﻭﺙ ﺍﻟﻤﺘﻭﺍﻓﺭﺓ ﺤﺩﻴﺜﺎ ﺤﻴﺙ ﻭﺠﺩ ﻤﺎ ﺃﻨﻬﺎ ﻤﺘﻔﻘﺔ ﺇﻟﻰ ﺤﺩ .
الملخص الانجليزي
The design of the objective magnetic and electrostatic lenses with low aberration coefficients at low beam energies is of a considerable interest in various fields of electron spectroscopy. The present research work is concerned with intensive studies and calculations on both types of electron lenses (magnetic and electrostatic) in order to obtain the preferable design of a compound lens. An asymmetrical magnetic electron lens has been designed in conical shape geometry. The study is concerned with a set of asymmetrical two-coaxial overlapping cylinder electrostatic lenses, having different geometries for the outer electrode and length of the electrode gap, respectively. It was found that the geometrical shape of the outer electrode and the length of electrode gap have a clear effect on the electron optical properties of such lenses. It was noticed that the best optical properties occurred when the length of electrode gap (g) equals 5 mm. The results obtained for the objective magnetic lens and the electrostatic lens for the preferable design were compared with the results of the recent published papers. An improvement in the optical properties obtained by the proposed design was noticed to be improved compared to the published results
تاريخ النشر
19/08/2010
الناشر
Dirasat, Pure Sciences
رقم المجلد
37
رقم العدد
2
ISSN/ISBN
1560-456x
الصفحات
85-95
رابط الملف
تحميل (179 مرات التحميل)
الكلمات المفتاحية
Magnetic Lens, Electrostatic Lens, High Performance Objective Lens, Low Beam Energies, High Resolution.
رجوع