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Equivalent core-hole time-dependent density functional theory calculations of carbon 1s shake-up states of phthalocyanine
KTH, Superseded Departments, Biotechnology.
KTH, Superseded Departments, Biotechnology.ORCID iD: 0000-0003-0007-0394
KTH, Superseded Departments, Biotechnology.
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2004 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 70, no 19, 195214- p.Article in journal (Refereed) Published
Abstract [en]

The shake-up transition energies of the carbon 1s photoelectron spectrum of metal-free phthalocyanine (H2Pc) have been calculated by means of time-dependent density functional theory, for which an equivalent core approximation is adopted. Model calculations for the C 1s shake-up states of benzene are in excellent agreement with the latest experimental results. The complex C 1s shake-up structures associated with the aromatic and pyrrole carbons in the phthalocyanine are computed, as well as their ionization potentials. They allow us to determine the origin of the anomalous intensity ratio between the pyrrole and benzene carbons in a high resolution C 1s photoelectron spectrum measured for a H2Pc film, as due to a benzene-related shake-up contribution, hidden under the pyrrole main intensity feature.

Place, publisher, year, edition, pages
2004. Vol. 70, no 19, 195214- p.
Keyword [en]
benzene, carbon, phthalocyanine, pyrrole, article, chemical structure, density functional theory, electron, film, ionization, mathematical analysis, theoretical model, X ray photoelectron spectroscopy
National Category
Theoretical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-5931DOI: 10.1103/PhysRevB.70.195214ISI: 000225477800076Scopus ID: 2-s2.0-19944432507OAI: oai:DiVA.org:kth-5931DiVA: diva2:10470
Note
QC 20100914 QC 20110915Available from: 2005-09-05 Created: 2005-09-05 Last updated: 2011-09-15Bibliographically approved
In thesis
1. First principles modeling of soft X-ray spectroscopy of complex systems
Open this publication in new window or tab >>First principles modeling of soft X-ray spectroscopy of complex systems
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The electronic structures of complex systems have been studied by theoretical calculations of soft x-ray spectroscopies like x-ray photoelectron spectroscopy, near edge x-ray absorption fine structure, and x-ray emission spectroscopies. A new approach based on time dependent density functional theory has been developed for the calculation of shake-up satellites associated with photoelectron spectra. This method has been applied to the phthalocyanine molecule, describing in detail its electronic structure, and revealing the origin of controversial experimental features. It is illustrated in this thesis that the theoretical intepretation plays a fundamental role in the full understanding of experimental spectra of large and complex molecular systems. Soft x-ray spectroscopies and valence band photoelectron spectroscopies have proved to be powerful tools for isomer identification, in the study of newly synthesized fullerene molecules, the azafullerene C48N12 and the C50Cl10 molecule, as well as for the determination of the conformational changes in the polymeric chain of poly(ethylene oxide). The dynamics of the core excitation process, revealed by the vibrational fine structure of the absorption resonances, has been studied by means of density functional and transition state theory approaches.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. vi, 76 p.
Keyword
Molecular
National Category
Theoretical Chemistry
Identifiers
urn:nbn:se:kth:diva-403 (URN)91-7178-128-5 (ISBN)
Public defence
2005-09-15, Sal FA32, AlbaNova, Roslagstullsbacken 21, Stockholm, 10:15
Opponent
Supervisors
Note
QC 20100929Available from: 2005-09-05 Created: 2005-09-05 Last updated: 2010-09-29Bibliographically approved

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