A study of the adsorption sites of hydrogen on Ru(001) at saturation coverage by electron reflection

M. Lindroos; H. Pfnür; P. Feulner; D. Menzel

doi:10.1016/0039-6028(87)90046-X

A study of the adsorption sites of hydrogen on Ru(001) at saturation coverage by electron reflection

M. Lindroos, H. Pfnür, P. Feulner, D. Menzel

Chair of Experimental Physics

Technical University of Munich

Research output: Contribution to journal › Article › peer-review

114 Scopus citations

Abstract

Using very low energy electron diffraction the geometrical position of hydrogen adsorbed on Ru(001) has been studied. By comparison of calculations with experimental results for saturation coverage most of the high symmetry adsorption sites can be ruled out: hydrogen on Ru(001) cannot sit in top, bridge, or 3-fold hcp sites, but occupation of the 3-fold fcc sites and a 1:1 hydrogen to ruthenium ratio on the surface are favoured. Underlayer models and 2:1 H Ru ratios can also be clearly excluded. The best agreement is obtained with a HRu layer distance of 1.10 ± 0.06 Å (corresponding to a H-Ru bond length of 1.91 Å) and with about 2% contraction of the RuRu distance between the first and second atomic layers. The strong sensitivity of the VLEED method for the geometrical site of hydrogen on Ru(001) is shown to be mainly due to the extinction of the unoccupied surface state at 11.1 eV above the vacuum level by hydrogen.

Original language	English
Pages (from-to)	237-251
Number of pages	15
Journal	Surface Science
Volume	180
Issue number	1
DOIs	https://doi.org/10.1016/0039-6028(87)90046-X
State	Published - 1 Feb 1987

Access to Document

10.1016/0039-6028(87)90046-X

Cite this

@article{09d523c1c7c144d1afeab5e47c6fdbb6,

title = "A study of the adsorption sites of hydrogen on Ru(001) at saturation coverage by electron reflection",

abstract = "Using very low energy electron diffraction the geometrical position of hydrogen adsorbed on Ru(001) has been studied. By comparison of calculations with experimental results for saturation coverage most of the high symmetry adsorption sites can be ruled out: hydrogen on Ru(001) cannot sit in top, bridge, or 3-fold hcp sites, but occupation of the 3-fold fcc sites and a 1:1 hydrogen to ruthenium ratio on the surface are favoured. Underlayer models and 2:1 H Ru ratios can also be clearly excluded. The best agreement is obtained with a HRu layer distance of 1.10 ± 0.06 {\AA} (corresponding to a H-Ru bond length of 1.91 {\AA}) and with about 2% contraction of the RuRu distance between the first and second atomic layers. The strong sensitivity of the VLEED method for the geometrical site of hydrogen on Ru(001) is shown to be mainly due to the extinction of the unoccupied surface state at 11.1 eV above the vacuum level by hydrogen.",

author = "M. Lindroos and H. Pfn{\"u}r and P. Feulner and D. Menzel",

note = "Funding Information: One of us (MLJ is grateful to the Alexander von Humboldt Foundation for a Fellowship. This work has been supported by the Deutsche For-schungsgemeinschaftt hrough Sonderforschungsbereich 128.",

year = "1987",

month = feb,

day = "1",

doi = "10.1016/0039-6028(87)90046-X",

language = "English",

volume = "180",

pages = "237--251",

journal = "Surface Science",

issn = "0039-6028",

publisher = "Elsevier B.V.",

number = "1",

}

TY - JOUR

T1 - A study of the adsorption sites of hydrogen on Ru(001) at saturation coverage by electron reflection

AU - Lindroos, M.

AU - Pfnür, H.

AU - Feulner, P.

AU - Menzel, D.

N1 - Funding Information: One of us (MLJ is grateful to the Alexander von Humboldt Foundation for a Fellowship. This work has been supported by the Deutsche For-schungsgemeinschaftt hrough Sonderforschungsbereich 128.

PY - 1987/2/1

Y1 - 1987/2/1

N2 - Using very low energy electron diffraction the geometrical position of hydrogen adsorbed on Ru(001) has been studied. By comparison of calculations with experimental results for saturation coverage most of the high symmetry adsorption sites can be ruled out: hydrogen on Ru(001) cannot sit in top, bridge, or 3-fold hcp sites, but occupation of the 3-fold fcc sites and a 1:1 hydrogen to ruthenium ratio on the surface are favoured. Underlayer models and 2:1 H Ru ratios can also be clearly excluded. The best agreement is obtained with a HRu layer distance of 1.10 ± 0.06 Å (corresponding to a H-Ru bond length of 1.91 Å) and with about 2% contraction of the RuRu distance between the first and second atomic layers. The strong sensitivity of the VLEED method for the geometrical site of hydrogen on Ru(001) is shown to be mainly due to the extinction of the unoccupied surface state at 11.1 eV above the vacuum level by hydrogen.

AB - Using very low energy electron diffraction the geometrical position of hydrogen adsorbed on Ru(001) has been studied. By comparison of calculations with experimental results for saturation coverage most of the high symmetry adsorption sites can be ruled out: hydrogen on Ru(001) cannot sit in top, bridge, or 3-fold hcp sites, but occupation of the 3-fold fcc sites and a 1:1 hydrogen to ruthenium ratio on the surface are favoured. Underlayer models and 2:1 H Ru ratios can also be clearly excluded. The best agreement is obtained with a HRu layer distance of 1.10 ± 0.06 Å (corresponding to a H-Ru bond length of 1.91 Å) and with about 2% contraction of the RuRu distance between the first and second atomic layers. The strong sensitivity of the VLEED method for the geometrical site of hydrogen on Ru(001) is shown to be mainly due to the extinction of the unoccupied surface state at 11.1 eV above the vacuum level by hydrogen.

UR - http://www.scopus.com/inward/record.url?scp=0000060189&partnerID=8YFLogxK

U2 - 10.1016/0039-6028(87)90046-X

DO - 10.1016/0039-6028(87)90046-X

M3 - Article

AN - SCOPUS:0000060189

SN - 0039-6028

VL - 180

SP - 237

EP - 251

JO - Surface Science

JF - Surface Science

IS - 1

ER -

A study of the adsorption sites of hydrogen on Ru(001) at saturation coverage by electron reflection

Abstract

Access to Document

Other files and links

Fingerprint

Cite this