Coadsorption of Cs with O and CO on Ru(0001): Relation between structural and electronic properties

Y. J. Zhu; A. Morgante; A. P. Seitsonen; S. Wendt; Y. D. Kim; S. Schwegmann; H. Bludau; H. Over

doi:10.1016/S0079-6816(00)00018-6

Coadsorption of Cs with O and CO on Ru(0001): Relation between structural and electronic properties

Y. J. Zhu
, A. Morgante
, A. P. Seitsonen
, S. Wendt
, Y. D. Kim
, S. Schwegmann
, H. Bludau
, H. Over

Research output: Contribution to journal › Conference article › peer-review

1 Scopus citations

Abstract

We have studied structural, electronic and energetical aspects of ordered overlayers which were prepared by depositing Cs and CO on the (2×2)-O-precovered Ru(0001) surface. This ternary system may serve as a model system to study the Cs promoted CO oxidation reaction over Ru(0001). The electronic properties of the Cs subsystem, in particular the delocalized character of the Cs-6 s state, are only little affected by the (2×2)-O overlayer, while the addition of CO leads to a demetallization of the Cs overlayer. The ternary system reveals two metastable configurations (besides a stable one) which are produced at low sample temperatures. In the first one, Cs and CO have changed their adsorption sites if compared to the stable ternary (2×2)-O+Cs+CO phase, i.e. Cs sits in hcp and CO in on-top position. Our studies emphasize the importance of the threefold hollow position of CO to strengthen the back bonding of CO. The surface structure of the second metastable (ternary) arrangement is still elusive.

Original language	English
Pages (from-to)	211-223
Number of pages	13
Journal	Progress in Surface Science
Volume	64
Issue number	3
DOIs	https://doi.org/10.1016/S0079-6816(00)00018-6
State	Published - 1 Jun 2000
Externally published	Yes
Event	8th Symposium on Surface Physics - Trest Castle, Czech Republic Duration: 28 Jun 1999 → 2 Jul 1999

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title = "Coadsorption of Cs with O and CO on Ru(0001): Relation between structural and electronic properties",

abstract = "We have studied structural, electronic and energetical aspects of ordered overlayers which were prepared by depositing Cs and CO on the (2×2)-O-precovered Ru(0001) surface. This ternary system may serve as a model system to study the Cs promoted CO oxidation reaction over Ru(0001). The electronic properties of the Cs subsystem, in particular the delocalized character of the Cs-6 s state, are only little affected by the (2×2)-O overlayer, while the addition of CO leads to a demetallization of the Cs overlayer. The ternary system reveals two metastable configurations (besides a stable one) which are produced at low sample temperatures. In the first one, Cs and CO have changed their adsorption sites if compared to the stable ternary (2×2)-O+Cs+CO phase, i.e. Cs sits in hcp and CO in on-top position. Our studies emphasize the importance of the threefold hollow position of CO to strengthen the back bonding of CO. The surface structure of the second metastable (ternary) arrangement is still elusive.",

author = "Zhu, \{Y. J.\} and A. Morgante and Seitsonen, \{A. P.\} and S. Wendt and Kim, \{Y. D.\} and S. Schwegmann and H. Bludau and H. Over",

year = "2000",

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doi = "10.1016/S0079-6816(00)00018-6",

language = "English",

volume = "64",

pages = "211--223",

journal = "Progress in Surface Science",

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T2 - 8th Symposium on Surface Physics

AU - Zhu, Y. J.

AU - Morgante, A.

AU - Seitsonen, A. P.

AU - Wendt, S.

AU - Kim, Y. D.

AU - Schwegmann, S.

AU - Bludau, H.

AU - Over, H.

PY - 2000/6/1

Y1 - 2000/6/1

N2 - We have studied structural, electronic and energetical aspects of ordered overlayers which were prepared by depositing Cs and CO on the (2×2)-O-precovered Ru(0001) surface. This ternary system may serve as a model system to study the Cs promoted CO oxidation reaction over Ru(0001). The electronic properties of the Cs subsystem, in particular the delocalized character of the Cs-6 s state, are only little affected by the (2×2)-O overlayer, while the addition of CO leads to a demetallization of the Cs overlayer. The ternary system reveals two metastable configurations (besides a stable one) which are produced at low sample temperatures. In the first one, Cs and CO have changed their adsorption sites if compared to the stable ternary (2×2)-O+Cs+CO phase, i.e. Cs sits in hcp and CO in on-top position. Our studies emphasize the importance of the threefold hollow position of CO to strengthen the back bonding of CO. The surface structure of the second metastable (ternary) arrangement is still elusive.

AB - We have studied structural, electronic and energetical aspects of ordered overlayers which were prepared by depositing Cs and CO on the (2×2)-O-precovered Ru(0001) surface. This ternary system may serve as a model system to study the Cs promoted CO oxidation reaction over Ru(0001). The electronic properties of the Cs subsystem, in particular the delocalized character of the Cs-6 s state, are only little affected by the (2×2)-O overlayer, while the addition of CO leads to a demetallization of the Cs overlayer. The ternary system reveals two metastable configurations (besides a stable one) which are produced at low sample temperatures. In the first one, Cs and CO have changed their adsorption sites if compared to the stable ternary (2×2)-O+Cs+CO phase, i.e. Cs sits in hcp and CO in on-top position. Our studies emphasize the importance of the threefold hollow position of CO to strengthen the back bonding of CO. The surface structure of the second metastable (ternary) arrangement is still elusive.

UR - https://www.scopus.com/pages/publications/0033749456

U2 - 10.1016/S0079-6816(00)00018-6

DO - 10.1016/S0079-6816(00)00018-6

M3 - Conference article

AN - SCOPUS:0033749456

SN - 0079-6816

VL - 64

SP - 211

EP - 223

JO - Progress in Surface Science

JF - Progress in Surface Science

IS - 3

Y2 - 28 June 1999 through 2 July 1999

ER -

Coadsorption of Cs with O and CO on Ru(0001): Relation between structural and electronic properties

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