Apparatus for Direct Observation of Low-Energy Electron Diffraction Patterns
- 1 February 1960
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 31 (2) , 112-114
- https://doi.org/10.1063/1.1716903
Abstract
An apparatus for the observation of low‐energy electron diffraction patterns on a fluorescent screen is described. The diffracted electrons pass through a pair of grids and then are accelerated by a potential difference of the order of 103 v to excite the fluorescent screen. The equipment is designed for high vacuum, and pressures below 2×10−10 mm Hg have been maintained. Different gases can be introduced at low controlled pressures (10−9 to 10−7 mm Hg), and diffraction patterns produced by adsorbed layers can be photographed and studied. Typical diffraction patterns from a clean (111) face of a nickel crystal and from oxygen adsorbed upon this face are reproduced here.Keywords
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