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Surface Science

Volumes 482-485, Part 1
20 June 2001
Pages 90-95

PII: S0039-6028(01)00780-4
Copyright © 2001 Elsevier Science B.V. All rights reserved.

Surface enhanced infrared absorption of CO on smooth iron ultrathin films

Andreas Priebe, Gerhard Fahsold and Annemarie Pucci,

Kirchhoff-Institut für Physik, Universität Heidelberg, Albert-Ueberle-Strasse 3-5, D-69120 Heidelberg, Germany

Available online 2 August 2001.

Abstract

We have developed preparation procedures which suppress island growth of Fe on MgO(0 0 1) in ultrahigh vacuum. The resulting smooth Fe(0 0 1) films of few nanometer thickness have been exposed to CO. The infrared broadband transmission at normal incidence strongly changes with CO exposure. At about 2050 cm-1, i.e. in the stretching region of CO on on-top sites, enhanced infrared absorption with a Fano-like line shape is observed.

Author Keywords: Infrared absorption spectroscopy; Vibrations of adsorbed molecules; Surface electronic phenomena (work function, surface potential, surface states, etc.); Iron; Carbon monoxide; Metallic films

Article Outline

Acknowledgements
References


 (20K)
Fig. 1. LEED patterns at primary energy of 174 eV for (a) the MgO substrate and (b) for the 3 nm Fe on this substrate.

(10K)
Fig. 2. Normal incidence relative IR transmittance versus frequency (given in wave number units) of CO adsorbed at 100 K on 3 nm Fe(0 0 1) on MgO(0 0 1) for various exposures as indicated. The spectra are shown as they were measured. The horizontal lines mark a transmittance of 100% for the individual spectra.

(10K)
Fig. 3. Normal incidence relative IR transmittance spectra of CO on 3 nm Fe(0 0 1) on MgO(0 0 1) at 100 K at saturation exposure of 4.5 L compared to calculations: (a) experimental curve for saturation exposure (200 scans), (b¯e) calculations with various slight changes of iron film properties, (b) iron film parameters unchanged by the adsorbate and =2×10-4 cm, (c) corresponds to 14 cm-1, =-0.0025, and =2×10-4 cm, (d) corresponds to 14 cm-1, =-0.001, and =3.2×10-4 cm, (e) corresponds to 12 cm-1, =-0.0038, and =1×10-4 cm. For other parameters see text.

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Corresponding author. Fax: +49-6221-549262; email: a.pucci@urz.uni-heidelberg.de
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Surface Science
Volumes 482-485, Part 1
20 June 2001
Pages 90-95


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