A metastable-induced electron spectroscopy study on the process of oxygen adsorption at a Ni(1 1 0) surface

Ikari, Tomonori; Kojima, Takeaki; Yamada, Kenji; Naitoh, Masamichi; Nishigaki, S.

doi:10.1016/s0169-4332(03)00056-4

Cited by 5 publications

(3 citation statements)

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“…The total emission intensity in the MIES spectrum was decreased at the same H 2 -exposure range as the work-function was increased. This result supports the above consideration, because this decrease in the transition probability of Auger neutralization at the surface [7] is well explained by a disappearance of delocalized states from which an electron tunnels to the He-1s state. Figure 3 shows a series of MIES spectra taken from the O/Ni(110)-0.5 L surface (type (b)) in the progress of hydrogen adsorption.…”

Section: Exposuressupporting

confidence: 89%

“…In our previous report [7], we showed variations in the atomic and electronic structures in the oxidation process of the Ni(110) surface in the range of oxygen exposure S ox below 5 L using MIES and LEED. The structures of this Ni(110) surface are classified into the following four different types depending on At first we observed hydrogen-induced structural changes for each of the above mentioned types of the Ni(110) surface by LEED.…”

Section: Resultsmentioning

confidence: 79%

“…Peak P d , on the other hand, is weakened by the oxidation. This has been attributed to a decrease in the probability of Auger neutralization transition connecting the Ni 3d-states by an influence of oxygen adsorption [7]. When this surface was exposed to hydrogen gas for exposures of ∼25 L, the intensity of peak P d was recovered rapidly (spectrum (d)).…”

Section: Exposuresmentioning

confidence: 99%

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Surface-structure dependent reaction of hydrogen-assisted reduction at O/Ni(110) surfaces studied by MIES and LEED

Ikari

Kameishi

Arikado

et al. 2006

e-J. Surf. Sci. Nanotechnol.

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Surface-structure dependence of hydrogen-assisted reduction at oxidized Ni(110) surfaces was studied by metastable-induced electron spectroscopy (MIES) and low-energy electron diffraction (LEED). We prepared three different types of oxidized Ni(110) surfaces: (a) Low oxygen-coverage (3 × 1) surface; (b) moderate oxygen-coverage (2 × 1) surface; (c) high oxygen-coverage (3 × 1) surface. When exposed the surfaces (a) and (b) to hydrogen molecular gas at exposures 10∼100 L, their structures were changed to a hydrogen-adsorbed (1 × 1) structure. MIES clearly demonstrated a progress of hydrogen-assisted reduction by showing intensity decrease of the O2p-induced peak together with recovery in intensity of the Ni3d-induced peak and appearance of hydrogen-induced broad peak. Hydrogenated (1 × 1) surfaces, thus produced, were transformed to oxidized surfaces of the low-coverage (3 × 1) or (2 × 1) structure by being exposed to oxygen, depending on the oxygen exposure. These reduction/oxidation reactions took places reversibly. At the surface (c), however, such reactions were not observed in the range of hydrogen exposure up to 100 L at RT. This fact implies that the density of Ni-O-Ni atomic rows formed on the oxidized Ni(110) surfaces determines the progress of oxygen reduction reaction.