Home | My Profile | Contact Us
Research Trends Products  |   order gateway  |   author gateway  |   editor gateway  
ID:
Password:
Register | Forgot Password

Author Resources
 Author Gateway
 Article submission guidelines

Editor Resources
 Editor/Referee Gateway

Agents/Distributors
 Regional Subscription Agents/Distributors
 
Trends in Vacuum Science & Technology   Volumes    Volume 2 
Abstract
Appearance potential spectroscopy: a surface sensitive technique to characterize materials
A. R. Chourasia
Pages: 113 - 121
Number of pages: 9
Trends in Vacuum Science & Technology
Volume 2 

Copyright © 1997 Research Trends. All rights reserved

ABSTRACT
 
Appearance potential spectroscopy is a surface sensitive technique and provides information about the unoccupied density of states above the Fermi level. In this technique, the sample is bombarded with monoenergetic electrons and the x-ray or secondary electron yield is monitored. The signal is extracted from the large background using a potential modulation technique. The signal strength is proportional to the density of states at the Fermi level. Therefore, this technique is suitable to study the transition metals, the rare earths, and their intermetallics. It reveals a localized density of states because the matrix element governing the core hole production involves the very short range wave function of the initial core electron states. It reveals information regarding the total density of states of all symmetries in the conduction band. Since the density of states above EF correlate with the number and not with the energy, APS does not require energy analysis of the products of the experiment. It is, therefore, termed as a nondispersive spectroscopy. This accounts for the extreme simplicity of the APS spectrometer. In this article, the usefulness of this technique in elucidating the electronic structure of rare earth-transition metal intermetallics is discussed.
Buy this Article


 
search


E-Commerce
Buy this article
Buy this volume
Subscribe to this title
Shopping Cart

Quick Links
Login
Search Products
Browse in Alphabetical Order : Journals
Series/Books
Browse by Subject Classification : Journals
Series/Books

Miscellaneous
Ordering Information Ordering Information
Downloadable forms Downloadable Forms