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  Transition from a molecular to a metallic adsorbate system: Core-hole creation and decay dynamics for CO coordinated to Pd

Sandell, A., Libuda, J., Brühwiler, P. A., Andersson, S., Bäumer, M., Maxwell, A. J., et al. (1997). Transition from a molecular to a metallic adsorbate system: Core-hole creation and decay dynamics for CO coordinated to Pd. Physical Review B, 55(11), 7233-7243. doi:10.1103/PhysRevB.55.7233.

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PhysRevB.55.7233.pdf (Publisher version), 154KB
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PhysRevB.55.7233.pdf
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1997
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APS
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 Creators:
Sandell, A.1, Author
Libuda, Jörg1, 2, Author           
Brühwiler, P. A.3, Author
Andersson, S.3, Author
Bäumer, Marcus1, 2, Author           
Maxwell, A. J.3, Author
Mårtensson, N.3, Author
Freund, Hans-Joachim1, 2, Author           
Affiliations:
1Ruhr-Universität Bochum, Lehrstuhl für Physikalische Chemie 1, ou_persistent22              
2Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              
3Department of Physics, Uppsala University, Box 530, 751 21 Uppsala, Sweden, ou_persistent22              

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 Abstract: Two alternative methods to experimentally monitor the development of a CO-adsorption system that gradually changes from molecular to metallic are presented: firstly by adsorption of CO on Pd islands of increasing size deposited under UHV conditions, and secondly by growth of a Pd carbonyl-like species, formed by Pd deposition in CO atmosphere. The change in screening dynamics as a function of the number of metal atoms was investigated, using x-ray photoelectron spectroscopy, x-ray absorption spectroscopy, and core-hole-decay techniques. For CO adsorbed on UHV-deposited islands, the electronic properties of the whole CO-Pd complex is strongly dependent on island size and CO coverage: large amounts of CO result in a reduced screening ability, and small effects characteristic of molecular systems can be detected even for islands containing about 100 Pd atoms. If about half of the CO overlayer is desorbed, the CO-Pd complex exhibits a relaxation upon core ionization that is nearly as efficient as for metallic systems, even for the smallest islands (of the order of 10 Pd atoms). The growth of the carbonyl-like compound proceeds via formation of Pd-Pd bonds and has a relatively well-defined local structure. It is demonstrated that the properties of this compound approach those of an extended system for increasing coverages, and it may therefore also serve as an important link between a carbonyl and CO adsorbed on a metallic surface. A brief discussion is also given in which the results are discussed in terms of electronic properties of the thin alumina film versus bulk alumina and the applicability of the former to the construction of model catalysts.

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Language(s): eng - English
 Dates: 1996-10-151996-07-081997-03-15
 Publication Status: Issued
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevB.55.7233
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: 11 Volume / Issue: 55 (11) Sequence Number: - Start / End Page: 7233 - 7243 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008