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348 results on '"Bäumer, M."'

11. Molecules on Clean and Modified Oxide Surfaces

Author

Freund, H.-J., Klüner, T., Wichtendahl, R., Thiel, S., Adelt, M., Drachsel, W., Bäumer, M., Kuhlenbeck, H., Risse, T., Al-Shamery, K., Kampling, M., Hamann, H., Russo, Nino, editor, and Salahub, Dennis R., editor

Published
2000
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16. Electronic Excitations at Oxide Surfaces

Author

Kuhlenbeck, H., Bäumer, M., Bender, M., Cappus, D., Dillmann, B., Ehrlich, D., Rohr, F., Schönnenbeck, M., Seiferth, O., Freund, H.-J., Cardona, Manuel, editor, Fulde, Peter, editor, von Klitzing, Klaus, editor, Queisser, Hans-Joachim, editor, Lotsch, Helmut K. V., editor, Okiji, Ayao, editor, Kasai, Hideaki, editor, and Makoshi, Kenji, editor

Published
1996
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46. Photoemission study of praseodymia in its highest oxidation state: The necessity of in situ plasma treatment.

Author

Schaefer, A., Gevers, S., Zielasek, V., Schroeder, T., Falta, J., Wollschläger, J., and Bäumer, M.

Subjects
PRASEODYMIUM, PHOTOEMISSION, OXIDATION, RADIO frequency, STOICHIOMETRY, SILICON, X-ray diffraction
Abstract

A cold radio frequency oxygen plasma treatment is demonstrated as a successful route to prepare clean, well-ordered, and stoichiometric PrO2 layers on silicon. High structural quality of these layers is shown by x-ray diffraction. So far unobserved spectral characteristics in Pr 3d x-ray photoelectron (XP) spectra of PrO2 are presented as a fingerprint for praseodymia in its highest oxidized state. They provide insight in the electronic ground state and the special role of praseodymia among the rare earth oxides. They also reveal that former XP studies suffered from a significant reduction at the surface. [ABSTRACT FROM AUTHOR]

Published
2011
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47. Surface structure of Co–Pd bimetallic particles supported on Al[sub 2]O[sub 3] thin films studied using infrared reflection absorption spectroscopy of CO.

Author

Carlsson, A. F., Bäumer, M., Risse, T., and Freund, H.-J.

Subjects
*INFRARED spectroscopy, *CARBON compounds, *BIMETALLISM, *THIN films, *ALUMINUM oxide, *NUCLEATE boiling
Abstract

Infrared reflection absorption spectroscopy of CO has been used as a surface-sensitive probe for the available binding sites of Co–Pd bimetallic particles supported on a thin alumina film. A high-coverage state is obtained on the Co particles in addition to atop sites, attributable to a M(CO)[sub n] species. Bridge and threefold sites are not detected from CO stretching on the Co particles. When both metals are deposited sequentially at 300 K, Pd easily forms a shell on existing Co particles. In the reverse order, much more Co is required to coat Pd particles, because it nucleates between Pd particles as well as on top of them. For both metals, atop sites are better preserved at various bimetallic compositions because they are statistically less vulnerable than threefold hollow sites. The stretching frequency of CO to a given site is nearly independent of the bimetallic composition. © 2003 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2003
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