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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Ed. by Rademann, Klaus

12 Issues per year

IMPACT FACTOR 2016: 1.012

CiteScore 2016: 0.99

SCImago Journal Rank (SJR) 2016: 0.463
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Volume 222, Issue 5-6 (May 2008)


CO2 Adlayers on the Mixed Terminated ZnO(10-10) Surface Studied by He Atom Scattering, Photoelectron Spectroscopy and Ab Initio Electronic Structure Calculations

K. Kotsis / D. Stodt / V. Staemmler / R. Kovacik / B. Meyer / Franziska Traeger / D. Langenberg / Th. Strunskus / M. Kunat / Christof Wöll
Published Online: 2009-09-25 | DOI: https://doi.org/10.1524/zpch.2008.6014

He-atom scattering (HAS), X-ray photoelectron spectroscopy (XPS and NEXAFS), periodic density functional theory and quantum chemical ab initio cluster calculations have been used for characterizing the adsorption of CO2 on the mixed terminated ZnO(10-10) surface. The HAS data allow to identify three different structural phases of CO2 in the monolayer regime: A high-density (1×1) phase at low temperature, a lower density (2×1) phase at higher temperatures, and in addition an incommensurate phase (which has not been reported before) with a slightly lower coverage and a 2.3-fold periodicity at surface temperatures above 270 K. XPS and NEXAFS measurements performed for the two low-coverage phases show that CO2 is adsorbed in form of a carbonate species. This is supported by the ab initio calculations for CO2 adsorbed on ZnO(10-10). The calculated XP and NEXAFS spectra agree with the experimental data and are only compatible with an adsorbed carbonate species, the presence of physisorbed CO2 can be excluded. In addition, the calculations demonstrate that X-ray emission spectroscopy (XES) is a sensitive method to distinguish between linear CO2 and carbonate.

Keywords: ZnO; HAS; NEXAFS; XPS; Ab Initio Electronic Structure Calculations

About the article

*Corresponding author. E-mail:

Received: 2007-11-29

Revised: 2007-12-02

Published Online: 2009-09-25

Published in Print: 2008-05-01

Citation Information: Zeitschrift für Physikalische Chemie, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1524/zpch.2008.6014.

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