Characterization of composite electron source

العناوين الأخرى

توصيف مصادر الإلكترونات المركبة

مقدم أطروحة جامعية

al-Qudah, Ala Muhammad

مشرف أطروحة جامعية

Fischer, Andreas
al-Musa, Marwan Sulayman

أعضاء اللجنة

al-Dumur, Hammud Abd al-Hamid
Jaradat, Imad Khalid Yusuf
al-Umari, Muhammad Ali

الجامعة

جامعة مؤتة

الكلية

كلية العلوم

القسم الأكاديمي

قسم الفيزياء

دولة الجامعة

الأردن

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2016

الملخص الإنجليزي

This thesis deals with the process of field-induced electron emission from the surfaces of metals into vacuum, before and after coating by a dielectric material.

This process – induced by an intense external electrostatic field and usually called cold field electron emission (CFE) – is technically important due to its large number of applications, such as electron sources for microscopes and field emission displays.

The research described in the thesis addresses the effect of an insulating layer (epoxylite resin) on the field emission characteristics of clean tungsten tips.

Several tips, with different apex radii, have been prepared, and then examined in a standard Field Electron Microscope (FEM).

Various field electron emission characteristics have been measured under ultra-high vacuum (UHV) conditions, before and after coating by dielectric materials.

The measurements recorded include current-voltage (I–V) characteristics presented as Fowler-Nordheim (FN) plots, scanning electron micrographs and spatial current distributions (electron emission images).

In order to study the effects of the dielectric coating on field emission.

التخصصات الرئيسية

الفيزياء

عدد الصفحات

199

قائمة المحتويات

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-731642