| 1. |
- Karis, O, et al.
(author)
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Probing surface states of Cu/Ni thin films using x-ray absorption spectroscopy
- 2001
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In: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 63:11
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Journal article (peer-reviewed)abstract
- Surface and interface properties of Cu thin films (1–4 monolayers) deposited on Ni(100) have been extracted by means of x-ray absorption spectroscopy and analyzed in combination with ab initio density-functional calculations. An unoccupied Cu surface state is identified in an x-ray absorption spectra and studied as a function of film thickness. Experimental data is supported by calculations of the layer-resolved density of states and the results from this combined theoretical-experimental effort show that the surface state is almost entirely located on the atomic layer closest to the vacuum. Our results also indicate strong hybridization between unoccupied states at the Cu/Ni interface boundary.
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| 2. |
- Karis, O, et al.
(author)
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Observation of short- and long-range hybridization of a buried Cu monolayer in Ni
- 2000
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In: PHYSICAL REVIEW B. - 0163-1829. ; 62:24, s. R16239-R16242
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Journal article (peer-reviewed)abstract
- The electronic structure of a Cu monolayer buried in Ni fcc(100) is studied by means of x-ray emission and absorption spectroscopies in combination with first principles calculations. The local character of the x-ray probes allows us to investigate change
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| 3. |
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| 4. |
- O'Shea, J. N., et al.
(author)
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Hydrogen-bond induced surface core-level shift in isonicotinic acid
- 2001
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In: Journal of Physical Chemistry B. - : American Chemical Society (ACS). - 1089-5647 .- 1520-6106 .- 1520-5207. ; 105:10, s. 1917-1920
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Journal article (peer-reviewed)abstract
- Intermolecular hydrogen-bonding in thick films of isonicotinic acid evaporated onto rutile TiO2(110) has been investigated with X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS). The rate of deposition is found to be a key factor in overcoming the kinetic barriers to extensive hydrogen-bond formation, which, when present, gives rise to large energy shifts between bulk and surface in both the N1s XPS and XAS. The origin of the surface core-level shift is attributed to the presence of non-hydrogen-bonded nitrogen atoms in the surface layer.
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| 5. |
- O'Shea, J. N., et al.
(author)
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Hydrogen-bond induced surface core-level shift in pyridine carboxylic acids
- 2001
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In: Surface Science. - 0039-6028 .- 1879-2758. ; 486:3, s. 157-166
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Journal article (peer-reviewed)abstract
- Intermolecular hydrogen bonding in thick films of pyridine carboxylic acids (isonicotinic; picolinic and bi-isonicotinic acid) evaporated onto rutile TiO2(1 1 0) has been investigated with X-ray photoelectron spectroscopy and X-ray absorption spectroscopy. These molecules are shown to be strongly H-bonded in the condensed phase, and a surface core-level shift is observed due to the presence of non-H-bonded nitrogen atoms in the surface layer. Density functional theory calculations are used to relate the experimental data to the proposed bonding configurations based on the surface termination of the known equilibrium solid-state structure. A kinetic barrier, attributed to the high degree of molecular orientation required for the formation of extended H-bonding networks, has also been investigated.
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| 6. |
- Arvanitis, D, et al.
(author)
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Magnetic X-ray circular dichroism on in situ grown 3d magnetic thin films on surfaces
- 2001
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In: JOURNAL OF SYNCHROTRON RADIATION. - : MUNKSGAARD INT PUBL LTD. - 0909-0495. ; 8, s. 120-124
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Journal article (peer-reviewed)abstract
- Epitaxic thin and ultrathin films on surfaces allow crystallographic phases that do not occur naturally in the bulk to be stabilized. They also offer new possibilities for an improved understanding of soft X-ray photoabsorption in magnetic systems. Data c
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| 7. |
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| 8. |
- Dunn, JH, et al.
(author)
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Influence of source coherence on X-ray absorption spectroscopy
- 2000
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In: PHYSICAL REVIEW LETTERS. - : AMERICAN PHYSICAL SOC. - 0031-9007. ; 84:5, s. 1031-1034
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Journal article (peer-reviewed)abstract
- Core-level x-ray absorption spectroscopy measurements have bean performed at the L-3,L-2 edges of Fe and Co thin films. The degree of source coherence was varied using soft x rays from five different beam lines. We observe an increase of the L edge resona
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| 9. |
- Dunn, JH, et al.
(author)
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Magnetisation reorientation in ultra-thin Fe films on Cu(100) upon deposition of Co
- 2001
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In: JOURNAL OF SYNCHROTRON RADIATION. - : MUNKSGAARD INT PUBL LTD. - 0909-0495. ; 8, s. 463-465
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Journal article (peer-reviewed)abstract
- Ultra thin films of Fe deposited on the (100) surface of a Cu single crystal exhibit a net perpendicular magnetic anisotropy. The addition of very low coverages of Co results in the easy magnetic direction reorienting into the film plane. This behavior is
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| 10. |
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