Advanced tip shape analysis for tungsten microemitters

Other Title(s)

تحليل متقدم لأشكال مصادر الإلكترونات المصنعة من مادة التنغستن

Dissertant

Madanat, Mazin Adil

Thesis advisor

al-Musa, Marwan Sulayman
al-Rabadi, Anas Nasir

Comitee Members

al-Dumur, Hammud
al-Umari, Muhammad Ali
al-Sabayilah, Muayyad Abd al-Rahim

University

Mutah University

Faculty

Faculty of Science

Department

Department of physics

University Country

Jordan

Degree

Master

Degree Date

2014

English Abstract

This thesis deals with the process of electron emission from a surface of metals into the vacuum due to an intense applied electric field.

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

The research work within the thesis addresses the advanced analysis of the emission behavior of various tip shapes.

For this purpose, a number of tungsten tips with different apex radii have been prepared.

These tips were mounted in a standard Field Emission Microscope (FEM) and various field electron emission characteristics have been measured under ultra high vacuum (UHV) conditions.

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

Under this regime, the effects of thermal treatment (baking process) on the emitters was investigated.

Main Subjects

Physics

No. of Pages

113

Table of Contents

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-402047