Structural determination of<i>p</i>2<i>mg</i>(2×1)CO/Ni(110) with the use of angle-resolved photoemission extended fine structure

Huang, Zheng-Qing; Hussain, Zahid; Huff, W.R.A.; Moler, Edward J.; Shirley, D. A.

doi:10.1103/physrevb.48.1696

Cited by 35 publications

(13 citation statements)

References 34 publications

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“…Our results for Pd are in close agreement with most recent findings regarding Ni and Rh, 15,[18][19][20]53 indicating that the structure of this overlayer is the same for the three different metal substrates. Our work confirms the conclusions of the RAIRS experiments, 10,11 showing that for this system the site assignment based on vibrational frequencies was correct, and disagrees with the results of the tensor LEED study of Wander, Hu, and King, 17 which assigned CO to the atop adsorption site.…”

Section: Data Analysis and Discussionsupporting

confidence: 95%

“…10, 11, 17͒. In the former case the most recent papers 15,19,20 favor the short-bridge site; in the latter, a recent tensor LEED experiment indicates ''atop'' adsorption in contrast with earlier RAIRS studies, 10,11 which suggested ''short bridge'' on the basis of the analysis of the measured CO stretching frequency.…”

Section: Introductionmentioning

confidence: 81%

“…[1][2][3][4] Several experimental techniques have been used to investigate the geometry of this structure: electron stimulated desorption ion angular distribution, electron energy-loss spectroscopy, RAIRS ͑reflection-absorption infrared spectroscopy͒, XPD ͑x-ray photoelectron diffraction͒, ARPEFS ͑angle-resolved photoelectron spectroscopy fine structure͒, tensor LEED ͑low-energy electron diffraction͒, near-edge x-ray absorption fine structure, and STM ͑scanning tunneling microscopy͒. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Agreement has been reached on the geometrical structure of the adsorbed overlayer: CO molecules are arranged in a zigzag fashion along the ͓110͔ crystallographic direction, with their axes tilted from the surface normal alternatively towards the ͓001͔ and the ͓001͔ directions, the value of the tilt angle varying from 13°to 27°. 5,6,[12][13][14][15][16][17][18][19][20] On the other hand, in spite of the large number of experiments performed, the determination of the adsorption site has been controversial: both ''atop'' and ''short-bridge'' sites have been proposed for CO adsorption on Ni͑110͒ ͑Refs.…”

Section: Introductionmentioning

confidence: 99%

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Structural determination of the Pd{110}(2×1)p2mg-CO system by means of high-energy x-ray photoelectron diffraction

et al. 1996

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The adsorption geometry of CO in the ͑2ϫ1͒p2mg phase on Pd͑110͒ has been determined by means of an application of high-energy x-ray photoelectron diffraction, which achieves adsorption site sensitivity in a forward scattering geometry. Information about the surface structure is extracted from the azimuthal angle dependence of the surface component of the Pd 3d 5/2 photoemission peak. Surface sensitivity is obtained by working at grazing emission angles. The experimental data are compared with single scattering cluster simulations, giving clear evidence that the CO molecules are located in short-bridge sites. The estimated Pd-C distance is 1.86Ϯ0.09 Å. A CO tilt angle of 24Ϯ3°from the surface normal was determined by means of the C 1s polar scan along the plane normal to the ͓001͔ direction. ͓S0163-1829͑96͒09327-1͔

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Section: Data Analysis and Discussionsupporting

confidence: 95%

Section: Introductionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

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Structural determination of the Pd{110}(2×1)p2mg-CO system by means of high-energy x-ray photoelectron diffraction

et al. 1996

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“…ARPEFS yields precise information about both the local structure around the adsorbates and the adsorbate-induced relaxation of the substrates. [6][7][8][9][10][11][12] These studies have shown that ARPEFS data and their Fourier transforms ͑FT's͒ can be described mainly in terms of backscattering events. The positions of all the strong peaks in ARPEFS FT's from adsorbates can be predicted from a trial structure with fairly good accuracy based on a single-scattering cluster model together with the concept of a backscattering cone.…”

Section: Introductionmentioning

confidence: 99%

Angle-resolved photoemission extended fine structure of the Ni3p,Cu3s,and Cu3pcore levels of the respective clean (111)

et al. 1997

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We report a non-s initial-state angle-resolved photoemission extended fine-structure ͑ARPEFS͒ study of clean surfaces for the purpose of further understanding the technique. The surface structure sensitivity of ARPEFS applied to clean surfaces and to arbitrary initial states is studied using normal photoemission data taken from the Ni 3p core levels of a Ni͑111͒ single crystal and the Cu 3s and the Cu 3p core levels of a Cu͑111͒ single crystal. The Fourier transforms of these clean surface data are dominated by backscattering. Unlike the s initial-state data, the p initial-state data show a peak in the Fourier transform corresponding to in-plane scattering from the six nearest neighbors to the emitter. Evidence was seen for single-scattering events from the same plane as the emitters and double-scattering events. Using a recently developed, multiplescattering calculation program, ARPEFS data from clean surfaces and from p initial states can be modeled to high precision. Although there are many layers of emitters when measuring photoemission from a clean surface, test calculations show that the ARPEFS signal is dominated by photoemission from atoms in the first two crystal layers. Thus ARPEFS applied to clean surfaces is sensitive to surface reconstruction. The best-fit calculation for clean Ni͑111͒ indicates an expansion of the first two layers.

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“…The platinum crystal was previously carefi.dly prepared by oxygen roasting and argon ion sputtering procedures monitored by STM and XPS in a separate study [27], and was easily cleaned during this experiment by sputtering and annealing cycles. The surface cleanliness and order were periodically checked with synchrotrons XPS and LEED.…”

Section: Methodsmentioning

confidence: 99%

Fourier transform photoelectron diffraction and its application to molecular orbitals and surface structure

Zhou

1998

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Structural determination ofp2mg(2×1)CO/Ni(110) with the use of angle-resolved photoemission extended fine structure

Cited by 35 publications

References 34 publications

Structural determination of the Pd{110}(2×1)p2mg-CO system by means of high-energy x-ray photoelectron diffraction

Structural determination of the Pd{110}(2×1)p2mg-CO system by means of high-energy x-ray photoelectron diffraction

Angle-resolved photoemission extended fine structure of the Ni3p,Cu3s,and Cu3pcore levels of the respective clean (111)

Fourier transform photoelectron diffraction and its application to molecular orbitals and surface structure

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