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Studies of Model Nanostructured Materials: Geometric and Electronic Structure, and sub-10 fs Charge Transfer Dynamics
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
2002 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A number of nanostructured systems has been investigated by means of Photoemission and X-ray absorption spectroscopies and by Scanning tunneling microscopy with emphasis on the geometric and electronic structure and the excited-state charge transfer dynamics. These systems comprise aromatic molecules on semiconductor surfaces (titanium dioxide), metal clusters, and an alkali-C60 compound.

Electronic and geometric structure are complementary to each other, and changes in the geometric structure are accompanied by changes in the electronic structure. Therefore, a detailed investigation of the latter makes it possible to draw conclusions on the former. In particular, this close relationship has been used to characterise the adsorbate geometry of the pyridine-carboxylic acid monomers on rutile TiO2(110), which is determined by the strong substrate bond as well as interadsorbate interactions. Similarly, it has been found that bi-isonicotinic acid adsorbs on a nanostructured anatase TiO2 film by forming strong bonds between both carboxylic groups and the substrate titanium atoms. For deposited metal clusters, the core binding energies are found to mirror the cluster size.

Resonant core electron spectroscopies have been employed to elucidate the excited-state charge transfer dynamics with respect to the transfer of an excited electron from the bi-isonicotinic acid and isonicotinic acid adsorbates to a titanium dioxide semiconductor surface. An important aspect has been the development of new variations of the method in order to be able to unravel the spectra of these relatively complex systems. While a strong excitonic effect localises the excited electron on the adsorbate for the lowest excited state, excitation to the higher excited states leads to an ultrarapid charge transfer on a low- to sub-femtosecond timescale.

In LiC60 the character of the alkali-C60 bond has been investigated. The balance between the different energy contributions points to an ionic bond with an important element of covalency.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 2002. , p. 81
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 752
Keywords [en]
Physics
Keywords [sv]
Fysik
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:uu:diva-2636ISBN: 91-554-5404-6 (print)OAI: oai:DiVA.org:uu-2636DiVA, id: diva2:161974
Public defence
2002-10-11, Häggsalen, Ångströmlaboratoriet, Uppsala, 13:15
Opponent
Available from: 2002-09-20 Created: 2002-09-20Bibliographically approved
List of papers
1. Beamline-induced Chromium Structure in Carbon K-edge Absorption Spectra
Open this publication in new window or tab >>Beamline-induced Chromium Structure in Carbon K-edge Absorption Spectra
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2001 In: Nucl. Inst. Meth. Phys. Res., Vol. 184, p. 609-614Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-89972 (URN)
Available from: 2002-09-20 Created: 2002-09-20Bibliographically approved
2. Hydrogen-bond induced surface core-level shift in isonicotinic acid
Open this publication in new window or tab >>Hydrogen-bond induced surface core-level shift in isonicotinic acid
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2001 (English)In: J. Phys. Chem. B, Vol. 105, p. 1917-1920Article in journal (Refereed) Published
National Category
Natural Sciences
Identifiers
urn:nbn:se:uu:diva-89973 (URN)
Available from: 2002-09-20 Created: 2002-09-20 Last updated: 2012-04-02Bibliographically approved
3. Hydrogen-bond induced surface core-level shift in pyridine carboxylic acids
Open this publication in new window or tab >>Hydrogen-bond induced surface core-level shift in pyridine carboxylic acids
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2001 (English)In: Surf. Sci., Vol. 486, p. 157-166Article in journal (Refereed) Published
National Category
Natural Sciences
Identifiers
urn:nbn:se:uu:diva-89974 (URN)
Available from: 2002-09-20 Created: 2002-09-20 Last updated: 2012-04-02Bibliographically approved
4. Structural study of absorption of isonicotinic acid and related molecules on rutile TiO2(110) I.: XAS and STM
Open this publication in new window or tab >>Structural study of absorption of isonicotinic acid and related molecules on rutile TiO2(110) I.: XAS and STM
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Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-89975 (URN)
Available from: 2002-09-20 Created: 2002-09-20 Last updated: 2010-01-13Bibliographically approved
5. Structural study of absorption of isonicotinic acid and related molecules on rutile TiO2(110) II.: XPS
Open this publication in new window or tab >>Structural study of absorption of isonicotinic acid and related molecules on rutile TiO2(110) II.: XPS
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Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-89976 (URN)
Available from: 2002-09-20 Created: 2002-09-20 Last updated: 2010-01-13Bibliographically approved
6. Core-hole screening efficiencies in molecular π systems estimated from a comparison of valence and core excitons
Open this publication in new window or tab >>Core-hole screening efficiencies in molecular π systems estimated from a comparison of valence and core excitons
Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-89977 (URN)
Available from: 2002-09-20 Created: 2002-09-20Bibliographically approved
7. Alignment of valence photoemission, X-ray absorption, and substrate density-of-states for an adsorbate on a semiconductor surface
Open this publication in new window or tab >>Alignment of valence photoemission, X-ray absorption, and substrate density-of-states for an adsorbate on a semiconductor surface
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Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-89978 (URN)
Available from: 2002-09-20 Created: 2002-09-20Bibliographically approved
8. Adsorption and charge transfer study of bi-isonicotinic acid on in situ grown anatase TiO2 nanoparticles
Open this publication in new window or tab >>Adsorption and charge transfer study of bi-isonicotinic acid on in situ grown anatase TiO2 nanoparticles
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Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-89979 (URN)
Available from: 2002-09-20 Created: 2002-09-20 Last updated: 2010-01-13Bibliographically approved
9. Experiemental evidence for sub-3-fs charge transfer from an aromatic adsorbate to a semiconductor
Open this publication in new window or tab >>Experiemental evidence for sub-3-fs charge transfer from an aromatic adsorbate to a semiconductor
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2002 In: Nature, Vol. 418, p. 620-623Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-89980 (URN)
Available from: 2002-09-20 Created: 2002-09-20Bibliographically approved
10. Excited-state charge transfer dynamics in systems of aromatic adsorbates on TiO2 studied with resonant core techniques
Open this publication in new window or tab >>Excited-state charge transfer dynamics in systems of aromatic adsorbates on TiO2 studied with resonant core techniques
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Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-89981 (URN)
Available from: 2002-09-20 Created: 2002-09-20 Last updated: 2010-01-13Bibliographically approved
11. Electron Spectroscopy Study of LiC60: Charge Transfer and Dimer Formation
Open this publication in new window or tab >>Electron Spectroscopy Study of LiC60: Charge Transfer and Dimer Formation
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2000 In: Phys. Rev. B, Vol. 62, p. 4253-4256Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-89982 (URN)
Available from: 2002-09-20 Created: 2002-09-20Bibliographically approved
12. X-ray photoelectron spectroscopy of low surface concentration mass-selected Ag clusters
Open this publication in new window or tab >>X-ray photoelectron spectroscopy of low surface concentration mass-selected Ag clusters
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2000 (English)In: J. Chem. Pys., Vol. 113, p. 9233-9238Article in journal (Refereed) Published
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-89983 (URN)
Available from: 2002-09-20 Created: 2002-09-20 Last updated: 2012-04-02Bibliographically approved

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