Hydrogen adsorption on Rh(110) studied by high resolution electron energy loss spectroscopy

Müssig, H.‐J.; Stenzel, W.; Song, Y.; Conrad, H.

doi:10.1016/0039-6028(94)91420-6

Cited by 8 publications

(12 citation statements)

References 20 publications

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“…27,28,41 These findings are supported by vibrational loss measurements: As demon-strated for the pairing-row reconstruction Ni͑110͒-͑1ϫ2͒-3H phase by applying selection rules for both dipole and impact electron scattering, 42 there is such a high tendency of the H atoms to choose a site with threefold coordination that the hydrogen atoms even refuse available ͑quasi-͒ fourfold sites and prefer to reside in threefold sites. For H adsorption on the Rh͑110͒ surface, vibrational loss measurements revealed that the H atoms adsorb in the quasi-threefold coordinated sites provided by the ͑111͒ microfacets on the Rh͑110͒ surface, 43 in agreement with the LEED results. 41 Previous and more recent HREELS measurements performed with both H/Ru͑1010͒ 14,44 and H/Re(1010) 45 may provide further clues on the local symmetry of the H adsorption site.…”

Section: Discussionsupporting

confidence: 86%

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Anomalous hydrogen adsorption sites found for the c(2×2)-3H phases formed on the Re(101̄0) and Ru(101̄0) surfaces

Döll

Hammer

Heinz

et al. 1998

The Journal of Chemical Physics

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Hydrogen adsorption on the ͑1010͒ surfaces of Ru and Re leads to the formation of c(2ϫ2)-3H phases. As determined by quantitative low-energy electron diffraction ͑LEED͒ and density functional theory calculations, hydrogen atoms, as expected, occupy threefold coordinated hcp sites along the densely packed rows and the unexpected short-bridge sites along the ridges in both c(2ϫ2) phases. The Ru and Re substrates reconstruct only weakly and in a very similar fashion under hydrogen chemisorption. Most notably, there is a buckling in the third substrate layer of about 0.06 Å. Probably ͑though not outside the limits of error͒, there are also slightly lateral displacements ͑0.02 Å͒ of top-layer substrate atoms which are bridge-coordinated to hydrogen. The metalhydrogen bond lengths determined for both surfaces correspond to hydrogen radii in the expected range of 0.4-0.7 Å.

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Section: Discussionsupporting

confidence: 86%

“…The variance of the R factor amounts to var(R P ) ϭ0.08, i.e., all models with RϾ0. 43 can be ruled out. The all-beam R factors are R P ϭ0.30, 0.37, 0.35, 0.44, 0.39, 0.38, 0.41, and 0.32.…”

Section: A the Phase Re"101 0…-c"2؋2…-3hmentioning

confidence: 99%

Anomalous hydrogen adsorption sites found for the c(2×2)-3H phases formed on the Re(101̄0) and Ru(101̄0) surfaces

Döll

Hammer

Heinz

et al. 1998

The Journal of Chemical Physics

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“…On Rh͑110͒ an intensive HREELS study shows the vertical mode at 86 meV, the parallel modes at 55 meV and 66 meV, shifting with higher coverage to 50 meV and 108 meV, respectively. 17 c. Bridge site: Since the HAS investigations show hydrogen occupying a site intermediate between the threefold and the bridge site we give here the only HREELS data known to us on hydrogen adsorption in a bridge site which is found on tungsten. On W͑100͒ the bridge site is found for high coverages and its vertical vibration appears at 130 meV.…”

Section: Previous Hreels Results On H/rh and On H Adsorbed In Bridge mentioning

confidence: 99%

Helium atom scattering and HREELS investigations of the H/Rh(311) adsorption system

Farı́as

Siebentritt

Apel

et al. 1997

The Journal of Chemical Physics

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Helium scattering structure analyses of the chemisorbed hydrogen phases on Co (1010) Hydrogen adsorption on Rh͑311͒ at 110 K leads to the appearance of ͑1ϫ1͒H, ͑1ϫ3͒H, ͑1ϫ2͒H and ͑1ϫ2͒ REC ordered layers. A previous He-atom scattering ͑HAS͒ investigation of the ͑1ϫ1͒H phase has revealed that its coverage is ⌰ϭ1 ML, whereby the H-atoms are adsorbed between the topmost bridge sites and the adjacent threefold hollow sites on the ͑111͒-microfacets. In this paper we present a combined HAS and HREELS structural analysis of the higher coverage phases. The structures derived from the HAS data show that, starting with the ͑1ϫ1͒H phase, the ͑1ϫ3͒H is formed by the adsorption of H-atoms in the wells between every third close-packed row, whereas adsorption on the same sites but between every second row leads to the completion of the ͑1ϫ2͒H phase. Accordingly, the corresponding coverages are 4/3 ML and 3/2 ML. The HREELS results clearly demonstrate the existence of two different H-species in the ͑1ϫ3͒H phase and three in the ͑1ϫ2͒H phase, supporting the HAS results.

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“…We have focused on the theoretical understanding of the hydrogen interactions with Rh metal (110) surface because there are many experimental data available and some initial theoretical work on clean Rh(110 ) surface [1][2][3][4][5][6]. We have focused on the theoretical understanding of the hydrogen interactions with Rh metal (110) surface because there are many experimental data available and some initial theoretical work on clean Rh(110 ) surface [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…[001] long-bridge and[1][2][3][4][5][6][7][8][9][10] short-bridge sites, the [1-10] short-bridge site is the most energy-favored site as shown inFigure 1. This H atom has a quasi 3-fold coordination [1-6, 10-15.…”

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confidence: 99%

H Adsorption On Rh (110) Surface

Chen

2006

MRS Proc.

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We have used the density functional theory to study the H adsorption phenomena on Rh (110) surface with H coverage ranging from 0.33 to 2 monolayers. The H 2 molecule was found to dissociate into two H atoms on Rh(110) surface. We found H atom favors the three-fold coordinated site as observed experimentally. We confirmed the existence of 1x3-H (0.33 H coverage), 1x2-H (0.5 H coverage), 1x3-2H (0.66 H coverage), and 1x1-2H (2.0 H coverage) ordered structures. We also found that the proposed 1x3-2H structure for H coverage of 0.66 is not the lowest energy configuration. We have proposed a new 1x3-2H structure that needs to be tested by future experiments.

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Hydrogen adsorption on Rh(110) studied by high resolution electron energy loss spectroscopy

Cited by 8 publications

References 20 publications

Anomalous hydrogen adsorption sites found for the c(2×2)-3H phases formed on the Re(101̄0) and Ru(101̄0) surfaces

Anomalous hydrogen adsorption sites found for the c(2×2)-3H phases formed on the Re(101̄0) and Ru(101̄0) surfaces

Helium atom scattering and HREELS investigations of the H/Rh(311) adsorption system

H Adsorption On Rh (110) Surface

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