CO Adsorption on Reconstructed Ir(100) Surfaces from UHV to mbar Pressure: A LEED, TPD, and PM-IRAS Study

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CO Adsorption on Reconstructed Ir(100) Surfaces from UHV to mbar Pressure: A LEED, TPD, and PM-IRAS Study. / Anic, Kresimir; Bukhtiyarov, Andrey V.; Li, Hao et al.
In: Journal of Physical Chemistry C, Vol. 120.2016, No. 20, 21.04.2016, p. 10838-10848.

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Anic K, Bukhtiyarov AV, Li H, Rameshan C, Rupprechter G. CO Adsorption on Reconstructed Ir(100) Surfaces from UHV to mbar Pressure: A LEED, TPD, and PM-IRAS Study. Journal of Physical Chemistry C. 2016 Apr 21;120.2016(20):10838-10848. doi: 10.1021/acs.jpcc.5b12494

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Anic, Kresimir ; Bukhtiyarov, Andrey V. ; Li, Hao et al. / CO Adsorption on Reconstructed Ir(100) Surfaces from UHV to mbar Pressure : A LEED, TPD, and PM-IRAS Study. In: Journal of Physical Chemistry C. 2016 ; Vol. 120.2016, No. 20. pp. 10838-10848.

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@article{19a56d577642428dad78bea4d38e74ba,
title = "CO Adsorption on Reconstructed Ir(100) Surfaces from UHV to mbar Pressure: A LEED, TPD, and PM-IRAS Study",
abstract = "Clean and stable surface modifications of an iridium (100) single crystal, i.e.; the (1 × 1) phase, the (5 × 1) reconstruction, and the oxygen-terminated (2 × 1)-O surface, were prepared and characterized by low energy electron diffraction (LEED), temperature-programmed desorption (TPD), infrared reflection absorption spectroscopy (IRAS) and polarization modulation IRAS (PM-IRAS). The adsorption of CO in UHV and at elevated (mbar) pressure/temperature was followed both ex situ and in situ on all three surface modifications, with a focus on mbar pressures of CO. The Ir(1 × 1) surface exhibited c(4 × 2)/c(2 × 2) and c(6 × 2) CO structures under low pressure conditions, and remained stable up to 100 mbar and 700 K. For the (2 × 1)-O reconstruction CO adsorption induced a structural change from (2 × 1)-O to (1 × 1), as confirmed by LEED, TPD, and IR. For Ir (2 × 1)-O TPD indicated that CO reacted with surface oxygen forming CO2. The (5 × 1) reconstruction featured a reversible and dynamic behavior upon CO adsorption, with a local lifting of the reconstruction to (1 × 1). After CO desorption, the (5 × 1) structure was restored. All three reconstructions exhibited CO adsorption with on-top geometry, as evidenced by IR. With increasing CO exposure the resonances shifted to higher wavenumber, due to adsorbate-adsorbate and adsorbate-substrate interactions. The largest wavenumber shift (from 2057 to 2100 cm-1) was observed for Ir(5 × 1) upon CO dosing from 1 L to 100 mbar.",
author = "Kresimir Anic and Bukhtiyarov, {Andrey V.} and Hao Li and Christoph Rameshan and G{\"u}nther Rupprechter",
note = "Publisher Copyright: {\textcopyright} 2016 American Chemical Society.",
year = "2016",
month = apr,
day = "21",
doi = "10.1021/acs.jpcc.5b12494",
language = "English",
volume = "120.2016",
pages = "10838--10848",
journal = "Journal of Physical Chemistry C",
issn = "1932-7447",
publisher = "American Chemical Society",
number = "20",

}

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TY - JOUR

T1 - CO Adsorption on Reconstructed Ir(100) Surfaces from UHV to mbar Pressure

T2 - A LEED, TPD, and PM-IRAS Study

AU - Anic, Kresimir

AU - Bukhtiyarov, Andrey V.

AU - Li, Hao

AU - Rameshan, Christoph

AU - Rupprechter, Günther

N1 - Publisher Copyright: © 2016 American Chemical Society.

PY - 2016/4/21

Y1 - 2016/4/21

N2 - Clean and stable surface modifications of an iridium (100) single crystal, i.e.; the (1 × 1) phase, the (5 × 1) reconstruction, and the oxygen-terminated (2 × 1)-O surface, were prepared and characterized by low energy electron diffraction (LEED), temperature-programmed desorption (TPD), infrared reflection absorption spectroscopy (IRAS) and polarization modulation IRAS (PM-IRAS). The adsorption of CO in UHV and at elevated (mbar) pressure/temperature was followed both ex situ and in situ on all three surface modifications, with a focus on mbar pressures of CO. The Ir(1 × 1) surface exhibited c(4 × 2)/c(2 × 2) and c(6 × 2) CO structures under low pressure conditions, and remained stable up to 100 mbar and 700 K. For the (2 × 1)-O reconstruction CO adsorption induced a structural change from (2 × 1)-O to (1 × 1), as confirmed by LEED, TPD, and IR. For Ir (2 × 1)-O TPD indicated that CO reacted with surface oxygen forming CO2. The (5 × 1) reconstruction featured a reversible and dynamic behavior upon CO adsorption, with a local lifting of the reconstruction to (1 × 1). After CO desorption, the (5 × 1) structure was restored. All three reconstructions exhibited CO adsorption with on-top geometry, as evidenced by IR. With increasing CO exposure the resonances shifted to higher wavenumber, due to adsorbate-adsorbate and adsorbate-substrate interactions. The largest wavenumber shift (from 2057 to 2100 cm-1) was observed for Ir(5 × 1) upon CO dosing from 1 L to 100 mbar.

AB - Clean and stable surface modifications of an iridium (100) single crystal, i.e.; the (1 × 1) phase, the (5 × 1) reconstruction, and the oxygen-terminated (2 × 1)-O surface, were prepared and characterized by low energy electron diffraction (LEED), temperature-programmed desorption (TPD), infrared reflection absorption spectroscopy (IRAS) and polarization modulation IRAS (PM-IRAS). The adsorption of CO in UHV and at elevated (mbar) pressure/temperature was followed both ex situ and in situ on all three surface modifications, with a focus on mbar pressures of CO. The Ir(1 × 1) surface exhibited c(4 × 2)/c(2 × 2) and c(6 × 2) CO structures under low pressure conditions, and remained stable up to 100 mbar and 700 K. For the (2 × 1)-O reconstruction CO adsorption induced a structural change from (2 × 1)-O to (1 × 1), as confirmed by LEED, TPD, and IR. For Ir (2 × 1)-O TPD indicated that CO reacted with surface oxygen forming CO2. The (5 × 1) reconstruction featured a reversible and dynamic behavior upon CO adsorption, with a local lifting of the reconstruction to (1 × 1). After CO desorption, the (5 × 1) structure was restored. All three reconstructions exhibited CO adsorption with on-top geometry, as evidenced by IR. With increasing CO exposure the resonances shifted to higher wavenumber, due to adsorbate-adsorbate and adsorbate-substrate interactions. The largest wavenumber shift (from 2057 to 2100 cm-1) was observed for Ir(5 × 1) upon CO dosing from 1 L to 100 mbar.

UR - http://www.scopus.com/inward/record.url?scp=84971383923&partnerID=8YFLogxK

U2 - 10.1021/acs.jpcc.5b12494

DO - 10.1021/acs.jpcc.5b12494

M3 - Article

AN - SCOPUS:84971383923

VL - 120.2016

SP - 10838

EP - 10848

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

SN - 1932-7447

IS - 20

ER -