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Surface-enhanced infrared absorption?

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Surface Science

Volumes 433-435
2 August 1999
Pages 79-82

PII: S0039-6028(99)00073-4
Copyright © 1999 Elsevier Science B.V. All rights reserved.

Oliver Krauth, Gerhard Fahsold and Annemarie Lehmann ^,

Institut für Angewandte Physik, Ruprecht-Karls-Universität Heidelberg, Albert-Ueberle-Str. 3_¯5, D-69120 Heidelberg, Germany

Available online 21 August 2000.

In ultra-high vacuum (UHV) we have measured infrared transmission spectra of CO on ultra-thin films of iron grown at about 315 K on UHV-cleaved MgO(001). Even at normal incidence of light we observe several asymmetric CO stretching lines with positions, intensities and shapes dependent on film morphology. The CO stretching lines observed are enhanced by at least two orders of magnitude with respect to adiabatic values. Enhancement and asymmetry are correlated to the curvature of transmission spectra of the bare iron films which is a measure of the dynamic conductivity, i.e., of the degree of continuity of the films formed by the growth of three-dimensional epitaxial islands.

Author Keywords: Carbon monoxide; Infrared absorption spectroscopy; Iron; Metallic films; Vibrations of adsorbed molecules

1. Introduction
2. Experimental
3. Results and discussion
4. Summary and conclusions
Acknowledgements
References

(9K)
Fig. 1. Relative transmittance of iron films on MgO(001), temperature and film thickness as indicated.

(8K)
Fig. 2. Relative transmittance of Fe/MgO(001) after CO adsorption (continuous lines represent the experimental spectra, broken lines the Fano-like fit, see text); temperature, CO exposure and iron thickness as indicated. Fit parameters: ₀ is 2014 cm^-1 for 0.5 nm, 2023 cm^-1 for 1 nm and 1987 cm^-1 for 4.3 nm; is 103 cm^-1 for 0.5 nm, 87 cm^-1 for 1 nm and 77 cm^-1for 4.3 nm; the asymmetry ₀ is 0.4 for 0.5 nm, 1.14 for 1 nm and 0.61 for 4.3 nm. ² corresponds to the oscillator strength. It is (in 10^-9 A V^-1) 220 for 0.5 nm and for 1 nm, but it is 500 for 4.3 nm.

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Corresponding author. New surname: Pucci. Fax: +49-6221-549262; email: bj4@ix.urz.uni-heidelberg.de

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Surface Science
Volumes 433-435
2 August 1999
Pages 79-82

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