J. Pantförder

Friedrich-Alexander-Universität Erlangen-Nürnberg

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Hans‐Peter Steinrück

Friedrich-Alexander-Universität Erlangen-Nürnberg

Georg Held

Diamond Light Source

R. Denecke

Leipzig University

Ch. Ammon

Friedrich-Alexander-Universität Erlangen-Nürnberg

Junfa Zhu

University of Science and Technology of China

T. Brammer

Forschungszentrum Jülich

Bernd Stannowski

Helmholtz-Zentrum Berlin für Materialien und Energie

T. Liebschner

Thomas Fuhrmann‐Lieker

University of Kassel

M. Kinne

Friedrich-Alexander-Universität Erlangen-Nürnberg

Cooperative Institutions

Friedrich-Alexander-Universität Erlangen-Nürnberg

Forschungszentrum Jülich

Universität Ulm

Helmholtz-Zentrum Berlin für Materialien und Energie

Leipzig University

National Synchrotron Radiation Laboratory

University of Bremen

University of Würzburg

Technische Universität Berlin

Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute

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New setup for in situ x-ray photoelectron spectroscopy from ultrahigh vacuum to 1mbar

Review of Scientific Instruments (2004)

J. Pantförder S. Pöllmann Junfa Zhu D. Borgmann R. Denecke

In an effort to extend the pressure range for electron-based spectroscopies from ultrahigh vacuum into the so-called pressure gap region, we have built a new apparatus for in situ x-ray photoelectron spectroscopy up to 1mbar. The principle of the experimental setup is based on a modified hemispherical electron energy analyzer, a modified twin anode x-ray source, and several differential-pumping stages between sample region and electron detection. The reaction gas is provided in situ either by background dosing or, as a new feature, by beam dosing, using a directed gas beam from a small tube. The latter allows for higher local pressures. The performance of the new setup is discussed, deriving normalization procedures from the analysis of the attenuation of the substrate photoemission intensity by the increasing gas phase pressure. In addition, the change of the work function due to changes in surface composition can be evaluated in situ by analyzing the binding energy shift of the gas phase core-level peaks. As a first study, measurements for the pressure dependence of CO adsorption on Pd(111) between 5×10−8 and 1mbar are presented.

10.1063/1.1824351

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Formation of a new type of chromium oxide by deposition of chromium onto water precovered Cu(111)

Surface Science (2001)

J. Pantförder R. Domnick Ch. Ammon Georg Held Hans‐Peter Steinrück

Chromium oxide

Deposition

10.1016/s0039-6028(01)01001-9

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Kinetic parameters of CO adsorbed on Pt(111) studied by in situ high resolution x-ray photoelectron spectroscopy

The Journal of Chemical Physics (2002)

M. Kinne Thomas Fuhrmann‐Lieker Caroline M. Whelan Junfa Zhu J. Pantförder

The kinetics of the adsorption system CO/Pt(111) has been studied by time-resolved high-resolution x-ray photoelectron spectroscopy using third generation synchrotron radiation at BESSY II. CO is dosed by a supersonic molecular beam device which allows for a high sample pressure (here up to 10−6 mbar) and a fast switching of the pressure. The site-specific occupation of CO adsorbed on on-top and bridge sites is determined quantitatively from C 1s spectra, which can be taken with a minimum collection time of 1.5 s per spectrum. Based on the observation of thermal equilibrium between the two sites, we perform a phenomenological analysis of the data, assuming a constant binding energy difference ΔE. From the on-top/bridge occupation ratio as a function of coverage obtained by uptake measurements we extract a value of ΔE=41 meV. With the same ansatz, ΔE is calculated from temperature-dependent measurements at a constant coverage. Finally, determination of the coverage during isothermal desorption is used to obtain the total binding energy of CO on Pt(111). Differences between our evaluation methods and literature reports are discussed.

Isothermal process

10.1063/1.1522405

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Progress of a-Si:H /μc-Si:H Tandem Solar Module Production on Substrate Size of 2,60 x 2,20 m2 at Sunfilm

World Conference on Photovoltaic Energy Conversion (2010)

B. Rech T. Hänel T. Brammer U. Klemm Bernd Stannowski

Tandem

10.4229/25theupvsec2010-3av.1.7

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Growth and electronic properties of thin Zn layers on Cu(111)

Surface Science (2001)

Ch. Ammon Georg Held J. Pantförder Hans‐Peter Steinrück

10.1016/s0039-6028(00)01083-9

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Citations (16)