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Identification of a laterally mobile state during CO adsorption

Beutler, A. LU ; Jaworowski, A. J. LU ; Wiklund, M. LU ; Sandell, A. LU ; Nyholm, R. LU ; Gray, S. LU and Andersen, J. N. LU (2000) In Journal of Physics: Condensed Matter 12(6). p.765-772
Abstract

We have investigated CO adsorption at 300 K on ∼ 1.5 atomic layer thick Pd films on a Mo(110) surface by high-resolution core level photoemission. We describe how high-resolution core level spectroscopy may be utilized to study the influence of laterally mobile states on the sticking probability of molecules on such a laterally heterogeneous surface. The present Pd films are laterally heterogeneous in the sense that the additional ∼ 0.5 atomic Pd layer forms mesoscopic one-layer thick islands on top of the first Pd layer. At 300 K, CO chemisorbs on these two-layer thick islands but not on the one-layer parts of the film. The rate at which these two-layer islands are filled by CO molecules as the surface is exposed to CO is found to be... (More)

We have investigated CO adsorption at 300 K on ∼ 1.5 atomic layer thick Pd films on a Mo(110) surface by high-resolution core level photoemission. We describe how high-resolution core level spectroscopy may be utilized to study the influence of laterally mobile states on the sticking probability of molecules on such a laterally heterogeneous surface. The present Pd films are laterally heterogeneous in the sense that the additional ∼ 0.5 atomic Pd layer forms mesoscopic one-layer thick islands on top of the first Pd layer. At 300 K, CO chemisorbs on these two-layer thick islands but not on the one-layer parts of the film. The rate at which these two-layer islands are filled by CO molecules as the surface is exposed to CO is found to be consistent with a picture where CO molecules that initially impinge on the one-layer parts of the surface enter a laterally mobile state and diffuse to the two-layer islands and adsorb there. This mobile state is in many respects similar to a classical precursor state.

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organization
publishing date
type
Contribution to journal
publication status
published
in
Journal of Physics: Condensed Matter
volume
12
issue
6
pages
8 pages
publisher
IOP Publishing
external identifiers
  • scopus:0005157290
ISSN
0953-8984
DOI
10.1088/0953-8984/12/6/301
language
English
LU publication?
yes
id
9e464859-5648-46c3-aeeb-b2403d2cde48
date added to LUP
2016-04-27 16:43:16
date last changed
2022-03-01 00:57:15
@article{9e464859-5648-46c3-aeeb-b2403d2cde48,
  abstract     = {{<p>We have investigated CO adsorption at 300 K on ∼ 1.5 atomic layer thick Pd films on a Mo(110) surface by high-resolution core level photoemission. We describe how high-resolution core level spectroscopy may be utilized to study the influence of laterally mobile states on the sticking probability of molecules on such a laterally heterogeneous surface. The present Pd films are laterally heterogeneous in the sense that the additional ∼ 0.5 atomic Pd layer forms mesoscopic one-layer thick islands on top of the first Pd layer. At 300 K, CO chemisorbs on these two-layer thick islands but not on the one-layer parts of the film. The rate at which these two-layer islands are filled by CO molecules as the surface is exposed to CO is found to be consistent with a picture where CO molecules that initially impinge on the one-layer parts of the surface enter a laterally mobile state and diffuse to the two-layer islands and adsorb there. This mobile state is in many respects similar to a classical precursor state.</p>}},
  author       = {{Beutler, A. and Jaworowski, A. J. and Wiklund, M. and Sandell, A. and Nyholm, R. and Gray, S. and Andersen, J. N.}},
  issn         = {{0953-8984}},
  language     = {{eng}},
  month        = {{02}},
  number       = {{6}},
  pages        = {{765--772}},
  publisher    = {{IOP Publishing}},
  series       = {{Journal of Physics: Condensed Matter}},
  title        = {{Identification of a laterally mobile state during CO adsorption}},
  url          = {{http://dx.doi.org/10.1088/0953-8984/12/6/301}},
  doi          = {{10.1088/0953-8984/12/6/301}},
  volume       = {{12}},
  year         = {{2000}},
}