Advanced

Adsorption of acetylene and hydrogen on Pd(111) : Formation of a well-ordered ethylidyne overlayer

Sandell, A. LU ; Beutler, A. LU ; Jaworowski, A. LU ; Wiklund, M. LU ; Heister, K.; Nyholm, R. LU and Andersen, J. N. LU (1998) In Surface Science 415(3). p.411-422
Abstract

The C2H2(+H)/Pd(111) system has been studied using high resolution core level spectroscopy and low energy electron diffraction (LEED). Two ordered phases were found when adsorbing C2H2 at 125 K, giving rise to a (2 × 2) and a (√3 × √3)R30° LEED pattern, respectively. When preadsorbing H at 110-150 K, the sticking probability of the C2H2 molecules is strongly reduced and only the (√3 × √3)R30° overlayer is formed. In all three of the ordered structures the C2H2 molecules are suggested to occupy the hollow sites. Heating of the (√3 × √3)R30° C2H2 + H layer to 350 K yields a well ordered (√3 × √3)R30° overlayer consisting... (More)

The C2H2(+H)/Pd(111) system has been studied using high resolution core level spectroscopy and low energy electron diffraction (LEED). Two ordered phases were found when adsorbing C2H2 at 125 K, giving rise to a (2 × 2) and a (√3 × √3)R30° LEED pattern, respectively. When preadsorbing H at 110-150 K, the sticking probability of the C2H2 molecules is strongly reduced and only the (√3 × √3)R30° overlayer is formed. In all three of the ordered structures the C2H2 molecules are suggested to occupy the hollow sites. Heating of the (√3 × √3)R30° C2H2 + H layer to 350 K yields a well ordered (√3 × √3)R30° overlayer consisting exclusively of ethylidyne (CCH3) positioned in the hollow sites. The formation of ethylidyne is furthermore found to be preceded by the formation of an intermediate species ("β") which probably is vinylidene. © 1998 Elsevier Science B.V. All rights reserved.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
keywords
Alkynes, Chemisorption, Low index single crystal surfaces, Palladium, Soft x-ray photoelectron spectroscopy, Surface chemical reaction, Surface structure
in
Surface Science
volume
415
issue
3
pages
12 pages
publisher
Elsevier
external identifiers
  • Scopus:0032500414
ISSN
0039-6028
language
English
LU publication?
yes
id
1b18e691-fb9d-49fb-95d6-c53766a0959a
date added to LUP
2016-04-27 16:50:03
date last changed
2016-10-13 05:07:09
@misc{1b18e691-fb9d-49fb-95d6-c53766a0959a,
  abstract     = {<p>The C<sub>2</sub>H<sub>2</sub>(+H)/Pd(111) system has been studied using high resolution core level spectroscopy and low energy electron diffraction (LEED). Two ordered phases were found when adsorbing C<sub>2</sub>H<sub>2</sub> at 125 K, giving rise to a (2 × 2) and a (√3 × √3)R30° LEED pattern, respectively. When preadsorbing H at 110-150 K, the sticking probability of the C<sub>2</sub>H<sub>2</sub> molecules is strongly reduced and only the (√3 × √3)R30° overlayer is formed. In all three of the ordered structures the C<sub>2</sub>H<sub>2</sub> molecules are suggested to occupy the hollow sites. Heating of the (√3 × √3)R30° C<sub>2</sub>H<sub>2</sub> + H layer to 350 K yields a well ordered (√3 × √3)R30° overlayer consisting exclusively of ethylidyne (CCH<sub>3</sub>) positioned in the hollow sites. The formation of ethylidyne is furthermore found to be preceded by the formation of an intermediate species ("β") which probably is vinylidene. © 1998 Elsevier Science B.V. All rights reserved.</p>},
  author       = {Sandell, A. and Beutler, A. and Jaworowski, A. and Wiklund, M. and Heister, K. and Nyholm, R. and Andersen, J. N.},
  issn         = {0039-6028},
  keyword      = {Alkynes,Chemisorption,Low index single crystal surfaces,Palladium,Soft x-ray photoelectron spectroscopy,Surface chemical reaction,Surface structure},
  language     = {eng},
  month        = {10},
  number       = {3},
  pages        = {411--422},
  publisher    = {ARRAY(0xc463058)},
  series       = {Surface Science},
  title        = {Adsorption of acetylene and hydrogen on Pd(111) : Formation of a well-ordered ethylidyne overlayer},
  volume       = {415},
  year         = {1998},
}