Auger electron spectroscopy and work function characterization of oxygen adsorption on Ba-covered Ni(110)

Vlachos, D.; Panagiotides, N.A.; Foulias, S.D.

doi:10.1088/0953-8984/15/47/022

Cited by 8 publications

(15 citation statements)

References 28 publications

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“…In conclusion, it seems that apart from Ba-O interaction on the surface, Ni-O interaction takes place as well, leading to NiO formation. This is also borne out by our recent AES and WF results of oxygen adsorption on a bariated nickel surface [32]. More specifically, low energy AES spectra show simultaneous development of NiO and BaO on a bariated nickel surface.…”

Section: Oxygen Adsorption On Ba/ni(110)supporting

confidence: 63%

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Barium and oxygen interaction on the Ni(110) surface at low coverages studied by soft x-ray photoemission spectroscopy: Ba negative binding energy shifts and their correlation with Auger electron spectroscopy shifts

Vlachos

Kamaratos²,

Foulias³

2006

J. Phys.: Condens. Matter

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In this work, barium and oxygen interaction on the Ni(110) surface is investigated, by means of soft x-ray photoemission spectroscopy (SXPS), mainly at submonolayer and monolayer coverages. The results show that oxygen interacts with barium and the substrate as well forming BaO and NiO respectively. The formation of both oxides is consistent with previous Auger electron spectroscopy (AES) results. The oxidation of barium on the surface induces negative binding energy shifts of the Ba low core atomic levels 4d, 5s and 5p. Both initial and final state effects are shown to be necessary in order to explain these peculiar energy shifts. This interpretation is based on correlating the core level binding energy shifts with previously recorded AES transition line shifts, also taking into account the changes of the work function of the surface. The analysis shows that the extra-atomic relaxation energy decreases on going from metallic Ba to BaO. This implies that the reduction of the free electron screening more than counteracts the increase in relaxation energy due to the polarizable O2− anions.

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Section: Oxygen Adsorption On Ba/ni(110)supporting

confidence: 63%

“…The processes we follow are (a) the oxidation of a bariated nickel surface and (b) barium deposition on an oxygenated nickel surface. The present work is a continuation of our previous works [32,33].…”

Section: Introductionsupporting

confidence: 59%

Barium and oxygen interaction on the Ni(110) surface at low coverages studied by soft x-ray photoemission spectroscopy: Ba negative binding energy shifts and their correlation with Auger electron spectroscopy shifts

Vlachos

Kamaratos²,

Foulias³

2006

J. Phys.: Condens. Matter

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“…The peak 67 eV is due to interatomic Auger-transition involving barium 4d, 5p levels and oxygen 2p level and indicates the formation of barium oxide [16]. The same Auger peaks were observed in experiments with oxidation of barium adfilms on different metals [16,17]. The growth of barium concentration caused the decay of chromium oxide Auger peaks 31 eV and 46 eV due to screening of oxide surface and partially due to reduction of chromium oxide to chromium.…”

Section: Methodssupporting

confidence: 53%

“…However, in the case of oxidation of barium films on surface of different metals [16,17,20,21], a larger exposition in oxygen enhanced the Auger-signal of barium oxide. This indicated a permanent growth of barium oxide layer.…”

Section: Methodsmentioning

confidence: 99%

Oxidation of barium on the surface of nanothick chromium oxide films grown on the (110) molybdenum substrate

Klimenko

Starovojtova

Zasimovich

et al. 2009

Materialwissenschaft Werkst

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electron spectroscopy and work function measurements were used to investigate adsorption of barium onto the surface of nanothick chromium oxide films grown on the (110) molybdenum substrate. We prepared smooth 3-monolayers (ML) thick pseudomorphic chromium oxide films and rough 2 -3 ML chromium oxide films carrying three-dimensional oxide nanoparticles (the Stranski-Krastanov (SK) surface morphology). The interaction of barium with chromium oxide films of both types was found to lead to barium oxide formation and partial reduction of chromium oxide to chromium. When barium was deposited onto a 3 ML pseudomorphic chromium oxide film, the barium oxidation at room temperature was restricted to formation of only one monolayer of barium oxide. However, in the case of barium adsorption on chromium oxide film with the SK type surface morphology, the oxidation encompassed 3 monolayers of barium. A strong effect of metal substrate-oxide film interface on the oxidation ability of nanothick oxide films was revealed. These results showed possibilities of tailoring surface properties of the barium oxide films by variation of their thickness and by substrate-film interface modification.

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“…Specifically, as long as the Ba overlayer is amorphous and at room temperature, the Ba(73 eV) ATL appears to be a single and rather sharp line. A weak peak at ∼68 eV is due to the oxidation of a small portion of the barium overlayer, owing to the high reactivity of barium to chemisorbed oxygen from the environment [9,10]. This peak disappears at temperatures >500 K indicating a dissociation of BaO on the surface.…”

Section: Resultsmentioning

confidence: 99%

The Low Energy Auger Electron Spectroscopy Lines as an Index of the Ba Overlayer Order on the Ni(110) Surface

Vlachos

Kamaratos

Foulias

2014

International Journal of Spectroscopy

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We investigate the interaction of Ba with the Ni(110) surface at elevated temperatures by means of Auger electron spectroscopy and low energy electron diffraction. The results show that annealing of the substrate causes desorption and ordering of the initially amorphous overlayer, resulting in c(2 × 2) and (2 × 2) structures. It is observed that the induced ordering crucially affects the lineshape of the double Auger transition line Ba(73 eV)N 45 O 23 P 1 , establishing this line as an index of ordering of the Ba overlayer. The underlying physics of this effect is discussed.

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Auger electron spectroscopy and work function characterization of oxygen adsorption on Ba-covered Ni(110)

Cited by 8 publications

References 28 publications

Barium and oxygen interaction on the Ni(110) surface at low coverages studied by soft x-ray photoemission spectroscopy: Ba negative binding energy shifts and their correlation with Auger electron spectroscopy shifts

Barium and oxygen interaction on the Ni(110) surface at low coverages studied by soft x-ray photoemission spectroscopy: Ba negative binding energy shifts and their correlation with Auger electron spectroscopy shifts

Oxidation of barium on the surface of nanothick chromium oxide films grown on the (110) molybdenum substrate

The Low Energy Auger Electron Spectroscopy Lines as an Index of the Ba Overlayer Order on the Ni(110) Surface

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