Interaction of hydrogen with Re(101̄0):H binding states and ordered phases

Muschiol, U.; Lenz, J.; Schwarz, E.; Christmann, K.

doi:10.1016/0039-6028(95)00175-1

Cited by 9 publications

(2 citation statements)

References 7 publications

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“…This was sufficient to produce the optimum coverage for the formation of the c(2ϫ2͒-3H phase. 15,16 The fractional-order LEED spots were well visible exhibiting an energy averaged ͑50-400 eV͒ intensity level of about 6% with respect to integral-order beams. The LEED IV curves were collected at a sample temperature of about 120 K using a computer-controlled video technique.…”

Section: A Hydrogen Adsorption On Re"101 0…mentioning

confidence: 95%

“…On Re(1010) and Ru͑1010͒ hydrogen atoms order into a c(2ϫ2) structure at coverage H ϭ3/2 which transforms into a (1ϫ1) structure at saturation coverage ( H ϭ2). [14][15][16] The strong LEED intensity of the fractional-order beams of both c(2ϫ2)-3H phases already indicates that at least some H-induced local displacements of the substrate atoms must be involved. The similarity between the chemically rather different metals extends also to the thermal desorption states of hydrogen, indicating that the H metal bondings are of comparable strengths at Re(1010) and Ru͑1010͒.…”

Section: Introductionmentioning

confidence: 99%

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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: A Hydrogen Adsorption On Re"101 0…mentioning

confidence: 95%

Section: Introductionmentioning

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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Adsorption of Hydrogen

Christmann

2015

Surface and Interface Science

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4.2 Electron work function of metals and semiconductors

Jakobi¹

2002

Landolt-Börnstein - Group III Condensed Matter

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If an electron beam is directed towards a surface, it gets reflected if its potential is equal to -(E P /e + ∆Φ), the negative value of the primary energy divided by e and corrected for ∆Φ between the surface and the electron emitter (in the widest sense: cathode, electron gun, etc.). Since the surface serves here as the anode in a diode configuration, the name diode method has been chosen. This method was introduced early by P.A. Anderson [35A]. Many details of different experimental set-ups are discussed in [73K2, 79H3]. It was pointed out [85K8] that for carefully chosen conditions and for a patchy surface, i.e., a surface consisting of a composite of smaller areas of different work function, the diode method measures the same arithmetical average of Φ as the Kelvin method (see below). How to use a HREEL spectrometer for the diode method is reported in Ref.[85S3]. Vibrating capacitor method (Kelvin)The vibrating capacitor method is based on the work of Lord Kelvin [1898K] and of Zisman [32Z]. A condensor is formed of the surface to be studied and a reference electrode in front of it which are connected by a ammeter and a variable voltage source. If the capacitance between the plates (sample and reference electrode) is changed, e.g., by changing their distance, a current will flow. By compensating the Ref. p. 4.2-118] 4.2 Electron work function of metals and semiconductors Lando lt-Börnstein New Series III/42A2 4.2-7contact potential difference through the voltage source, the current can be brought to zero. Since Φ of the surface is part of the contact potential, its changes relative to the reference electrode can be measured. A more extended description can be found in Ref. [79H3]. A very versatile instrument of this kind was developed by Besocke [76B]. Data collectionData have been collected for metal as well as semiconductor substrates. In the case of metals only elemental, single-crystalline samples were considered. There are a few exceptions to this general rule. Some metallic alloys are listed in case of single-crystalline samples of well defined (stoichiometric) composition. Some data are also incorporated for evaporated, mostly polycrystalline films of materials for which no single-crystal data are available. For semiconductor substrates, adsorbate-induced workfunction changes consist of two contributions: band-bending and electron-affinity changes. Systems were discarded for which the overall change in work function was small (<0.2 eV) or for which the authors did not report a separation of the two contributions. With respect to the adsorbates, only single-component adsorption layers were considered, i.e., co-adsorbates were omitted. Furthermore, it should be noted that completeness -although intended -could not be achieved. It was learned that work-function data are very often not in the center of a publication. Work-function data even seemed to many authors too marginal to give explicitly reference to them in the title, abstract or key words. Therefore, also computer based research could not guarant...

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Interaction of hydrogen with Re(101̄0):H binding states and ordered phases

Cited by 9 publications

References 7 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

Adsorption of Hydrogen

4.2 Electron work function of metals and semiconductors

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