Samarium-atom adsorption and desorption on iridium

Samarium-atom adsorption and desorption on iridium The adsorption and condensation of samarium on Ir(111) are investigated by thermionic emission spectroscopy and thermal desorption spectroscopy (TDS). During Sm deposition, the work function is found to fall monotonically from 5.8 to 2.7 eV and then to rise slowly to a plateau at 2.9 eV, for any substrate temperature from the range 700–1200 K. The optimal Sm coverage is estimated at 0.51 ± 0.03. The activation energy E+ and the preexponential factor C for Sm-ion desorption and those for Sm-atom desorption, E0 and D, respectively, are determined in the temperature range 1800–2050 K and at a coverage small enough not to alter the work function of the iridium. Their values are as follows: E+ = 5.72 ± 0.10 eV, E+ = 5.72 ± 0.10 eV, D ∼ 1 × 1013s−1, and C ∼ 1.3 × 1013 s−1. Several Sm phases are detected in each TDS peak. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Microelectronics Springer Journals

Samarium-atom adsorption and desorption on iridium

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Publisher
SP MAIK Nauka/Interperiodica
Copyright
Copyright © 2009 by Pleiades Publishing, Ltd.
Subject
Engineering; Electrical Engineering
ISSN
1063-7397
eISSN
1608-3415
D.O.I.
10.1134/S1063739709020061
Publisher site
See Article on Publisher Site

Abstract

The adsorption and condensation of samarium on Ir(111) are investigated by thermionic emission spectroscopy and thermal desorption spectroscopy (TDS). During Sm deposition, the work function is found to fall monotonically from 5.8 to 2.7 eV and then to rise slowly to a plateau at 2.9 eV, for any substrate temperature from the range 700–1200 K. The optimal Sm coverage is estimated at 0.51 ± 0.03. The activation energy E+ and the preexponential factor C for Sm-ion desorption and those for Sm-atom desorption, E0 and D, respectively, are determined in the temperature range 1800–2050 K and at a coverage small enough not to alter the work function of the iridium. Their values are as follows: E+ = 5.72 ± 0.10 eV, E+ = 5.72 ± 0.10 eV, D ∼ 1 × 1013s−1, and C ∼ 1.3 × 1013 s−1. Several Sm phases are detected in each TDS peak.

Journal

Russian MicroelectronicsSpringer Journals

Published: Mar 28, 2009

References

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