Adsorption of Li on Ni(110) surfaces at low and room temperature

Saltas, V.; Papageorgopoulos, C.A.

doi:10.1016/s0039-6028(00)00588-4

“…The initial dipole moment of Li adatoms, at very low coverage, was calculated by the Helmholtz equation [19] to be 2.0 D (debye unit). This value is the same with the theoretical value, 2.0 D, as it was calculated by Hartman [19], whereas it is much higher than the value of 0.6 D which was measured after Li deposition on Ni(110) surface [16]. This difference is attributed to the different adsorption geometry of Li atoms on the two substrates.…”

Section: Resultssupporting

confidence: 87%

“…The appearance of the 43 eV peak (which has been assigned as the Li (1s), O (2p), O (2p) Auger transition), above ten doses of Li deposition is consistent with the reconstruction of the surface and the intermixing of the Li with oxygen, which increases the Li-O interaction. Analogous peaks have been also measured during Li deposition on semiconducting [11] and metallic substrates [15,16].…”

Section: Resultsmentioning

confidence: 52%

Lithium adsorption on the SrTiO₃(100) surface

Mori¹,

Kamaratos²

2007

J. Phys.: Condens. Matter

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In this paper we study the kinetics of Li adsorption on the SrTiO3(100) (STO(100)) surface at room temperature (RT). The study took place in an ultra-high vacuum (UHV) by low-energy electron diffraction (LEED), Auger electron spectroscopy (AES), electron energy-loss spectroscopy (EELS), temperature-programmed desorption (TPD) and work function (WF) measurements. At low Li coverage (θ<0.5 ML), Li adsorbs as isolated atoms, whereas at higher coverage it intermixes with the oxygen of the substrate and/or it intercalates into the substrate. The sticking coefficient of Li on STO(100) is constant. The lithium remains in a non-metallic state on the surface. After heating at 1100 K, part of the Li remains on the surface.

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“…The threshold lithium dose resulting in the appearance of this peak is defined as that required for producing a single monolayer of lithium. A similar TPD pattern was found for lithium desorbing from a Ni(110) surface [31].…”

Section: Auger Electron Spectroscopysupporting

confidence: 73%

Plasma Facing Surface Composition During NSTX Li Experiments

Skinner¹,

Sullenberger²,

Koel³

et al. 2012

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Abstract:Lithium conditioned plasma facing surfaces have lowered recycling and enhanced plasma performance on many fusion devices. However, the nature of the plasma-lithium surface interaction has been obscured by the difficulty of in-tokamak surface analysis. We report laboratory studies of the chemical composition of lithium surfaces exposed to typical residual gases found in tokamaks. Solid lithium and a molybdenum alloy (TZM) coated with lithium has been examined using x-ray photoelectron spectroscopy, temperature programmed desorption, and Auger electron spectroscopy both in ultrahigh vacuum conditions and after exposure to trace gases. Lithium surfaces near room temperature were oxidized after exposure to 1-2 Langmuirs of oxygen or water vapor. The oxidation rate by carbon monoxide was four times less. Lithiated PFC surfaces in tokamaks will be oxidized in about 100 s depending on the tokamak vacuum conditions.

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Plasma facing surface composition during NSTX Li experiments

Skinner

¹

,

Sullenberger

²

,

Koel

³

et al. 2013

Journal of Nuclear Materials

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Abstract:Lithium conditioned plasma facing surfaces have lowered recycling and enhanced plasma performance on many fusion devices. However, the nature of the plasma-lithium surface interaction has been obscured by the difficulty of in-tokamak surface analysis. We report laboratory studies of the chemical composition of lithium surfaces exposed to typical residual gases found in tokamaks. Solid lithium and a molybdenum alloy (TZM) coated with lithium has been examined using x-ray photoelectron spectroscopy, temperature programmed desorption, and Auger electron spectroscopy both in ultrahigh vacuum conditions and after exposure to trace gases. Lithium surfaces near room temperature were oxidized after exposure to 1-2 Langmuirs of oxygen or water vapor. The oxidation rate by carbon monoxide was four times less. Lithiated PFC surfaces in tokamaks will be oxidized in about 100 s depending on the tokamak vacuum conditions.

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Adsorption of Li on Ni(110) surfaces at low and room temperature

Cited by 18 publications

References 29 publications

Lithium adsorption on the SrTiO₃(100) surface

Lithium adsorption on the SrTiO₃(100) surface

Plasma Facing Surface Composition During NSTX Li Experiments

Plasma facing surface composition during NSTX Li experiments

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Adsorption of Li on Ni(110) surfaces at low and room temperature

Cited by 18 publications

References 29 publications

Lithium adsorption on the SrTiO3(100) surface

Lithium adsorption on the SrTiO3(100) surface

Plasma Facing Surface Composition During NSTX Li Experiments

Plasma facing surface composition during NSTX Li experiments

Contact Info

Product

Resources

About

Lithium adsorption on the SrTiO₃(100) surface

Lithium adsorption on the SrTiO₃(100) surface