English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
 
 
DownloadE-Mail
  Structural studies of WC(0001) and the adsorption of benzene

Brillo, J., Hammoudeh, A., Kuhlenbeck, H., Panagiotides, N., Schwegmann, S., Over, H., et al. (1998). Structural studies of WC(0001) and the adsorption of benzene. Journal of Electron Spectroscopy and Related Phenomena, 96(1-3), 53-60. doi:10.1016/S0368-2048(98)00222-9.

Item is

Basic

show hide
Genre: Journal Article

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Brillo, Jürgen1, Author              
Hammoudeh, Ayman2, Author
Kuhlenbeck, Helmut1, Author              
Panagiotides, N.3, Author
Schwegmann, Stefan4, Author              
Over, Herbert4, Author              
Freund, Hans-Joachim1, Author              
Affiliations:
1Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              
2Yarmouk University, Faculty of Sciences, Department of Chemistry, Irbid, Jordan, ou_persistent22              
3Fritz Haber Institute, Max Planck Society, Faradayweg 4-6, 14195 Berlin, DE, ou_24021              
4Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              

Content

show
hide
Free keywords: -
 Abstract: We report on studies dealing with the structure of WC(0001) and the adsorption of benzene on this surface. An I(V)-low-energy electron diffraction structure analysis has been performed to elucidate the surface structure of WC(0001). These studies indicate that the surface consists of a tungsten layer covered by carbon randomly distributed on the hcp sites with a coverage of 30% that of a full carbon layer. The distance between this carbon layer and the tungsten layer beneath is enlarged by 5% with respect to the spacing between carbon and tungsten layers in the bulk. Only a small deviation from the bulk value was found for the distance between the first tungsten layer and the carbon layer below. No indications of surface reconstruction have been observed. Benzene adsorption was studied on clear oxygen covered and oxidized WC(0001). The benzene multilayer desorbs at T≤200 K. On stoichiometric WC(00001), molecular benzene of (sub)monolayer coverage is found up to temperatures of T≈230 K. After desorption of this species, small signals of fragments are visible in the photoelectron spectra up to T≈1000 K. Above this temperature, a graphite covered surface remains. On a surface covered by a thin closed oxide phase (WO) only multilayer adsorption is found; above T≈200 K no adsorption takes place under UHV conditions. Weakly oxidized WC(0001) interacts more strongly with benzene in that strong photoemission signals of a (sub)monolayer species are visible up to a temperature of T≈340 K.

Details

show
hide
Language(s): eng - English
 Dates: 1998-05-111998-06-121998-11
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/S0368-2048(98)00222-9
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Journal of Electron Spectroscopy and Related Phenomena
  Abbreviation : J. Electron Spectrosc. Relat. Phenom.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Amsterdam : Elsevier B.V.
Pages: 8 Volume / Issue: 96 (1-3) Sequence Number: - Start / End Page: 53 - 60 Identifier: ISSN: 0368-2048
CoNE: https://pure.mpg.de/cone/journals/resource/954925524767