Oxygen-induced near-surface structural rearrangements on Ni{001} studied by shadow-cone-enhanced secondary-ion mass spectrometry

C. Xu, J. S. Burnham, S. H. Goss, K. Caffey, Nicholas Winograd

Research output: Contribution to journalArticle

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Abstract

The surface structure of Ni{001} and the adsorption systems p(2×2) O/Ni{001} and c(2×2) O/Ni{001} have been studied by shadow-cone-enhanced secondary-ion mass spectrometry. The secondary Ni+-ion intensity has been measured as a function of the incidence angle of the primary Ar+-ion beam. The enhanced intensity features in the spectra are compared with results from a two-body-interaction calculation which uses the Moliére approximation to the Thomas-Fermi potential. For the clean Ni{001} surface the analysis indicates that the spacing between the first and second layer decreases from the bulk value of 1.76 to 1.68±0.06 Å. Moreover, the spacing between the second layers and the third layer remains nearly bulklike at 1.74±0.16 Å. For the oxygenated surfaces the O-Ni bond length is determined to be 1.96±0.05 Å, which corresponds to a height for the oxygen of 0.85 Å above the Ni substrate. The presence of oxygen is found to cause buckling in the second Ni layer in accord with previous low-energy-electron-diffraction observations. The magnitude of the buckling is found to be 0.26±0.12 Å and 0.20±0.10 Å for the p(2×2) and c(2×2) surfaces, respectively. These results suggest that the O-Ni bonding is highly localized and only modestly dependent upon coverage.

Original languageEnglish (US)
Pages (from-to)4842-4849
Number of pages8
JournalPhysical Review B
Volume49
Issue number7
DOIs
StatePublished - Jan 1 1994

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secondary ion mass spectrometry
cones
oxygen
buckling
spacing
electron diffraction
incidence
ion beams
adsorption
causes
approximation
ions
interactions
energy

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

@article{7019e270d2c54777bde956abd32c1ca3,
title = "Oxygen-induced near-surface structural rearrangements on Ni{001} studied by shadow-cone-enhanced secondary-ion mass spectrometry",
abstract = "The surface structure of Ni{001} and the adsorption systems p(2×2) O/Ni{001} and c(2×2) O/Ni{001} have been studied by shadow-cone-enhanced secondary-ion mass spectrometry. The secondary Ni+-ion intensity has been measured as a function of the incidence angle of the primary Ar+-ion beam. The enhanced intensity features in the spectra are compared with results from a two-body-interaction calculation which uses the Moli{\'e}re approximation to the Thomas-Fermi potential. For the clean Ni{001} surface the analysis indicates that the spacing between the first and second layer decreases from the bulk value of 1.76 to 1.68±0.06 {\AA}. Moreover, the spacing between the second layers and the third layer remains nearly bulklike at 1.74±0.16 {\AA}. For the oxygenated surfaces the O-Ni bond length is determined to be 1.96±0.05 {\AA}, which corresponds to a height for the oxygen of 0.85 {\AA} above the Ni substrate. The presence of oxygen is found to cause buckling in the second Ni layer in accord with previous low-energy-electron-diffraction observations. The magnitude of the buckling is found to be 0.26±0.12 {\AA} and 0.20±0.10 {\AA} for the p(2×2) and c(2×2) surfaces, respectively. These results suggest that the O-Ni bonding is highly localized and only modestly dependent upon coverage.",
author = "C. Xu and Burnham, {J. S.} and Goss, {S. H.} and K. Caffey and Nicholas Winograd",
year = "1994",
month = "1",
day = "1",
doi = "10.1103/PhysRevB.49.4842",
language = "English (US)",
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journal = "Physical Review B-Condensed Matter",
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Oxygen-induced near-surface structural rearrangements on Ni{001} studied by shadow-cone-enhanced secondary-ion mass spectrometry. / Xu, C.; Burnham, J. S.; Goss, S. H.; Caffey, K.; Winograd, Nicholas.

In: Physical Review B, Vol. 49, No. 7, 01.01.1994, p. 4842-4849.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Oxygen-induced near-surface structural rearrangements on Ni{001} studied by shadow-cone-enhanced secondary-ion mass spectrometry

AU - Xu, C.

AU - Burnham, J. S.

AU - Goss, S. H.

AU - Caffey, K.

AU - Winograd, Nicholas

PY - 1994/1/1

Y1 - 1994/1/1

N2 - The surface structure of Ni{001} and the adsorption systems p(2×2) O/Ni{001} and c(2×2) O/Ni{001} have been studied by shadow-cone-enhanced secondary-ion mass spectrometry. The secondary Ni+-ion intensity has been measured as a function of the incidence angle of the primary Ar+-ion beam. The enhanced intensity features in the spectra are compared with results from a two-body-interaction calculation which uses the Moliére approximation to the Thomas-Fermi potential. For the clean Ni{001} surface the analysis indicates that the spacing between the first and second layer decreases from the bulk value of 1.76 to 1.68±0.06 Å. Moreover, the spacing between the second layers and the third layer remains nearly bulklike at 1.74±0.16 Å. For the oxygenated surfaces the O-Ni bond length is determined to be 1.96±0.05 Å, which corresponds to a height for the oxygen of 0.85 Å above the Ni substrate. The presence of oxygen is found to cause buckling in the second Ni layer in accord with previous low-energy-electron-diffraction observations. The magnitude of the buckling is found to be 0.26±0.12 Å and 0.20±0.10 Å for the p(2×2) and c(2×2) surfaces, respectively. These results suggest that the O-Ni bonding is highly localized and only modestly dependent upon coverage.

AB - The surface structure of Ni{001} and the adsorption systems p(2×2) O/Ni{001} and c(2×2) O/Ni{001} have been studied by shadow-cone-enhanced secondary-ion mass spectrometry. The secondary Ni+-ion intensity has been measured as a function of the incidence angle of the primary Ar+-ion beam. The enhanced intensity features in the spectra are compared with results from a two-body-interaction calculation which uses the Moliére approximation to the Thomas-Fermi potential. For the clean Ni{001} surface the analysis indicates that the spacing between the first and second layer decreases from the bulk value of 1.76 to 1.68±0.06 Å. Moreover, the spacing between the second layers and the third layer remains nearly bulklike at 1.74±0.16 Å. For the oxygenated surfaces the O-Ni bond length is determined to be 1.96±0.05 Å, which corresponds to a height for the oxygen of 0.85 Å above the Ni substrate. The presence of oxygen is found to cause buckling in the second Ni layer in accord with previous low-energy-electron-diffraction observations. The magnitude of the buckling is found to be 0.26±0.12 Å and 0.20±0.10 Å for the p(2×2) and c(2×2) surfaces, respectively. These results suggest that the O-Ni bonding is highly localized and only modestly dependent upon coverage.

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