Accession Number : AD0700247

Title :   HIGH-ENERGY ELECTRON DIFFRACTION AND X-RAY EMISSION ANALYSIS OF SURFACES AND THEIR REACTION PRODUCTS,

Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF APPLIED CHEMISTRY

Personal Author(s) : Sewell,P. B. ; Mitchell,D. F. ; Cohen,M.

Report Date : 1969

Pagination or Media Count : 19

Abstract : A technique which can provide both structural and chemical information from surface films at the monolayer level has been developed. For structure studies the grazing incidence, high-energy electron-diffraction method has been applied in ultra-high vacuum. The portion of the specimen surface irradiated during electron-diffraction observations acts as a line source of x-rays located at the focus of a low-atomic-number x-ray spectrometer. The ultra-high-vacuum environment in the diffraction chamber is separated from that of the conventional vacuum spectrometer by an x-ray-transparent window. Characteristic K-alpha radiation from monolayer quantities of both carbon and oxygen on a low-index surface of iron has been observed. Diffraction patterns and x-ray information may be obtained from such structures simultaneously. Attempts to calibrate the apparatus for carbon and oxygen layers on iron are discussed in some detail. The method appears well suited to the study of kinetic phenomena in surface films of mean thickness less than 100A. (Author)

Descriptors :   (*SURFACE PROPERTIES, *ELECTRON DIFFRACTION), SPECTROMETERS, CARBON, OXYGEN, IRON, FILMS, CANADA

Subject Categories : Test Facilities, Equipment and Methods
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE