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@PHDTHESIS{Yang:825919,
author = {Yang, Xiaosheng},
othercontributors = {Tautz, Frank Stefan and Stadtmüller, Benjamin},
title = {{I}nvestigating the interaction between π-conjugated
organic molecules and metal surfaces with photoemission
tomography},
school = {RWTH Aachen University},
type = {Dissertation},
address = {Aachen},
publisher = {RWTH Aachen University},
reportid = {RWTH-2021-08602},
pages = {1 Online-Ressource : Illustrationen},
year = {2021},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University; Dissertation, RWTH Aachen University, 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 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 π-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 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–O covalent 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 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 = {134110 / 130000},
ddc = {530},
cid = {$I:(DE-82)134110_20140620$ / $I:(DE-82)130000_20140620$},
typ = {PUB:(DE-HGF)11},
doi = {10.18154/RWTH-2021-08602},
url = {https://publications.rwth-aachen.de/record/825919},
}
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