Low Energy Electron Diffraction from Single Crystal Surfaces. I. Apparatus Design.
Abstract
A low energy electron diffraction apparatus has been designed, developed, and constructed and will be used to study the surface condition and structure of single crystal metals and semicon ductors. The electron gun is adapted from a design by Farnsworth, uses a nickel matrix cath ode, and is capable of producing electrons with energies of 20 to several hundred electron volts with currents from 0.1 to 10 microamperes. The electrons diffracted from a surface can be scanned over a majority of an octant (0-75 degree colatitude 0-90 degree azimuth) using the general approach of Farnsworth, and currents as low as 1 times 10 to the -13th power amperes can be measured at the collector. An angle pro grammer has been developed to precisely program the angles to be swept, and the angular motion is transferred through a glass chamber wall by a pair of magnetic couplers. The apparatus and some of its characteristics are described. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1963
- Accession Number
- AD0426752
Entities
People
- D.e. Floyd
- E.l. Kern
- P.w. Bunce