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@PHDTHESIS{Yang:902299,
      author       = {Yang, Xiaosheng},
      title        = {{I}nvestigating the {I}nteraction between π-{C}onjugated
                      {O}rganic {M}olecules and {M}etal {S}urfaces with
                      {P}hotoemission {T}omography},
      volume       = {71},
      school       = {RWTH Aachen},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2021-04162},
      isbn         = {978-3-95806-584-0},
      series       = {Schriften des Forschungszentrums Jülich. Reihe Information
                      / Information},
      pages        = {xviii, 173 S.},
      year         = {2021},
      note         = {RWTH Aachen, Diss., 2021},
      abstract     = {Photoemission tomography (PT) is a combined experimental
                      and theoretical technique applied to molecule–metal
                      interfaces which uses angle-resolved photoemission
                      spectroscopy over a wide angular range, while the
                      photoelectron angular distributions in reciprocal space
                      (momentum maps, or called $\textit{k}$-maps) are interpreted
                      in terms of the molecular orbital structure of the initial
                      state. This thesis uses PT to investigate various aspects of
                      the interaction between $\pi$-conjugated organic molecular
                      adsorbates and metal surfaces: PT was successfully used to
                      identify the exact products of chemical reactions at
                      surfaces and their local bonding. The measured
                      $\textit{k}$-maps confirm a modification of the orbital
                      structure of dibromo-bianthracene on Cu(110) in the thermal
                      reaction and the fully hydrogenated bisanthene is found to
                      be the correct reaction intermediate. To decouple molecular
                      adsorbates from the metal substrate, PT was employed to
                      gauge whether charge is transferred through the interface.
                      Oxygen adsorbed on the Cu(100) surface immobilizes the
                      surface electrons in the Cu–Ocovalent bonds, thus
                      achieving electronic and physical decoupling of
                      perylene-tetracarboxylic-dianhydride as determined by
                      combined results of PT and normal incidence X-ray standing
                      waves. A special example of an electronically inhomogeneous
                      unary molecular layer on a metal surface is showcased in the
                      saturated monolayer of tetracene on Ag(110). With the help
                      of PT, two highest occupied molecular orbital peaks in the
                      photoemission spectra were found, indicating that two
                      molecular species coexist in the tetracene layer—while one
                      molecule remains neutral, another is charged. Finally, we
                      applied PT to study photoelectron angular distributions for
                      highly-hybridized molecule–metal systems, monolayers of
                      p-sexiphenyl, p-quinquephenyl, and pentacene on Cu(110) and
                      on Ag(110), respectively. In $\textit{k}$-maps measured for
                      the lowest unoccupied molecular orbital, PT has identified
                      the scattering of either the Shockley surface states or the
                      states around the projected bulk band gap. The scattering
                      vectors can be directly related to reciprocal lattice
                      vectors of the overlayer structure.},
      cin          = {PGI-3},
      cid          = {I:(DE-Juel1)PGI-3-20110106},
      pnm          = {5213 - Quantum Nanoscience (POF4-521)},
      pid          = {G:(DE-HGF)POF4-5213},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/902299},
}