Apparatus for Mössbauer effect emission and AES study of free surfaces
- 1 March 1979
- journal article
- Published by American Vacuum Society in Journal of Vacuum Science and Technology
- Vol. 16 (2) , 466-468
- https://doi.org/10.1116/1.569983
Abstract
A UHV system has been built for the study of single-crystal surfaces by Mössbauer effect emission spectroscopy (MEES) and AES. The sample temperature range extends from 1500–20 K. Ion sputtering and sample heating allow surface cleaning. The evaporation, by electron bombardment of 57Co electroplated onto a W wire tip, of several 0.001 monolayer (ML) of 57Co onto the surface is carried out at tempertures low enough to insure no surface diffusion. MEES data is then collected through a Be window with surface monitoring by AES. The MEES spectrum of a Ni(111) surface covered by one monolayer of contaminants is a broad, unresolved resonance. The 57Co sits at many different surface sites, many having large hyperfine fields. The MEES spectrum of 57Co on the surface of three or four layers of carbon on a polycrystalline Cu substrate displays a large quadrupole splitting with broadened linewidths.Keywords
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