An experimental study of hydrogen adsorption on beryllium

Ray, K.B.; Hannon, James B.; Plummer, E. W.

doi:10.1016/0009-2614(90)85248-b

Cited by 49 publications

(18 citation statements)

References 20 publications

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“…as the deposition temperature is lowered, it is possible that the surface hydride grows beyond the surface, and hence stabilizes. Similar to previous studies is it possible to facilitate hydrogenation of simple metals [11,12,14] by predissociating the hydrogen on a hot filament. Fig.…”

Section: Growth Of Mg On Mosupporting

confidence: 61%

“…This is not very surprising considering simple metals, lacking d-electrons, are very poor at dissociating hydrogen at such low temperatures, in agreement with Refs. [12,14]. The amount of hydrogen actually measured could be related to residual hydrogen in the background, adsorbing on the catalytically active Mo surface during deposition.…”

Section: Growth Of Mg On Mo(1 1 1) In Uhvmentioning

confidence: 99%

“…Unfortunately the hydrogen desorption could not be investigated in detail since the Mg single crystal already started to sublimate at 450 K. Here, evidence was found of a metastable surface hydride phase, and hydrogen desorption was observed from this phase. Other relevant work detailing the interaction of hydrogen with simple metals includes a study of hydrogen on beryllium [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Growth and hydrogenation of ultra-thin Mg films on Mo(111)

et al. 2005

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Section: Growth Of Mg On Mosupporting

confidence: 61%

Section: Growth Of Mg On Mo(1 1 1) In Uhvmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Growth and hydrogenation of ultra-thin Mg films on Mo(111)

et al. 2005

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“…A faint feature around 180 meV becomes discernible after 60 h and may be due to the presence of atomic hydrogen. 39 Off-specular loss spectra acquired from Be(0001) that stayed in ultrahigh vacuum for more than 10 h exhibit additional features in an energy range of 150-450 meV. These loss features are most likely the spectroscopic signatures of H and OH vibration modes (see below).…”

Section: Experimental and Theoretical Methodsmentioning

confidence: 97%

Oxygen vibrations and acoustic surface plasmon on Be(0001)

et al. 2012

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Spectroscopic signatures of vibrational excitations on initially oxidized Be(0001) are identified by a combination of electron energy loss spectroscopy and density functional calculations. Prominent spectral features are due to vibrations in a Be-O mixing layer. Scanning tunneling microscopy indicates that initial oxidation occurs locally in the form of islands. The acoustic surface plasmon persists on the oxygen-covered surface. Its dispersion has been determined along the¯ K direction and is virtually identical to the dispersion of the acoustic surface plasmon of the clean surface.

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“…Despite being the first wall material for ITER, basic single crystal beryllium surfaces have been studied only sparsely from an experimental standpoint. In prior cases researchers used electron spectroscopy to examine surface reconstruction or adsorption kinetics during exposure to a hydrogen atmosphere [3]. While valuable, these approaches lack the ability to directly detect the positioning of hydrogen on the surface.…”

Section: Introductionmentioning

confidence: 99%

Fundamental hydrogen interactions with beryllium : a magnetic fusion perspective.

Wampler

Felter²,

Whaley³

et al. 2012

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Increasingly, basic models such as density functional theory and molecular dynamics are being used to simulate different aspects of hydrogen recycling from plasma facing materials [1,2]. These models provide valuable insight into hydrogen diffusion, trapping, and recombination from surfaces, but their validation relies on knowledge of the detailed behavior of hydrogen at an atomic scale. Despite being the first wall material for ITER, basic single crystal beryllium surfaces have been studied only sparsely from an experimental standpoint. In prior cases researchers used electron spectroscopy to examine surface reconstruction or adsorption kinetics during exposure to a hydrogen atmosphere [3]. While valuable, these approaches lack the ability to directly detect the positioning of hydrogen on the surface. Ion beam techniques, such as low energy ion scattering (LEIS) and direct recoil spectroscopy (DRS), are two of the only experimental approaches capable of providing this information.In this study, we applied both LEIS and DRS to examine how hydrogen binds to the Be(0001) surface. Our measurements were performed using an angle-resolved ion energy spectrometer (ARIES) to probe the surface with low energy ions (500 eV -3 keV He + and Ne + .)We were able to obtain a "scattering maps" of the crystal surface [4], providing insight on how low energy ions are focused along open surface channels. Once we completed a characterization of the clean surface, we dosed the sample with atomic hydrogen using a heated tungsten capillary. A distinct signal associated with adsorbed hydrogen emerged that was consistent with hydrogen residing between atom rows. To aid in the interpretation of the experimental results, we developed a computational model to simulate ion scattering at grazing incidence [5]. For this purpose, we incorporated a simplified surface model into the Kalypso molecular dynamics code [6]. This approach allowed us to understand how the incident ions interacted with the surface hydrogen, providing confirmation of the preferred binding site.[1] A. Allouche, Phys. Rev. B, 78 (2008) 085429.[2] R. Stumpf and P

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An experimental study of hydrogen adsorption on beryllium

Cited by 49 publications

References 20 publications

Growth and hydrogenation of ultra-thin Mg films on Mo(111)

Growth and hydrogenation of ultra-thin Mg films on Mo(111)

Oxygen vibrations and acoustic surface plasmon on Be(0001)

Fundamental hydrogen interactions with beryllium : a magnetic fusion perspective.

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