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  The coverage dependence of the infrared absorption of CO adsorbed to NaCI(100)

Lau, J. A., Schönemann, A.-M., Schwarzer, D., & Wodtke, A. M. (2020). The coverage dependence of the infrared absorption of CO adsorbed to NaCI(100). The Journal of Chemical Physics, 153(15): 154703. doi:10.1063/5.0025799.

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Lau, J. A.1, Author              
Schönemann, A.-M.1, Author              
Schwarzer, D.1, Author              
Wodtke, A. M.2, Author              
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1Department of Dynamics at Surfaces, MPI for Biophysical Chemistry, Max Planck Society, ou_578600              
2Department of Dynamics at Surfaces, MPI for biophysical chemistry, Max Planck Society, ou_578600              

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 Abstract: CO adsorbed to NaCl(100) exhibits perhaps the weakest possible coupling between the adsorbate and solid. It is, therefore, an ideal system to observe the influence of adsorbate–adsorbate interactions on infrared absorption. In this work, we report polarized FTIR absorption spectra of CO/NaCl(100) as a function of coverage (0.02 ≤ θ ≤ 1 ML), where the coverage has been quantitatively determined by temperature-programmed desorption and molecular beam dosing. We extend a previous semi-empirical model designed to describe the screening of the local electric field due to dipole–dipole interactions in a CO monolayer. The extended model applies to sub-monolayer coverages and describes properly the electric field of the absorbed radiation at the vacuum–substrate interface. Fitting this model to coverage-dependent IR absorption data allows us to derive the vibrational and electronic polarizabilities [χv = 0.0435(14) Å3, χe = 3.30(36) Å3] and the integrated absorption cross section of 2.51(8) × 10−17 cm/molecule for an isolated CO molecule adsorbed at the NaCl (100) surface. The determined integrated absorption cross section is substantially smaller than that of gas phase CO.

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Language(s): eng - English
 Dates: 2020-10-19
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1063/5.0025799
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Title: The Journal of Chemical Physics
Source Genre: Journal
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Pages: 10 Volume / Issue: 153 (15) Sequence Number: 154703 Start / End Page: - Identifier: -