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- W2800511312 abstract "The thesis explores the dynamical properties of molecules and two-dimensional materials and their modifications due to the adsorption on surfaces. The first part of the investigations focuses on the phonon properties of graphene. A single layer of graphene was epitaxially grown on Ir(111) with high structural homogeneity and a single rotational domain. By means of angle-resolved inelastic electron scattering the phonon dispersion relation was acquired across the entire surface Brillouin zone. The expected Kohn anomaly at K is weaker than observed for pristine graphene and graphite. Density functional calculations rationalize this phenomenon in terms of a decrease of the electron-phonon coupling due to screening of graphene electron correlations by the metal substrate. Furthermore, graphene exhibits a moire superstructure which is due to different lattice constants of graphene and Ir(111). For the first time, it could be shown that the superstructure induces phonon replica which have not been reported so far. The second part of the investigations compares molecular vibrational excitations of phthalocyanines adsorbed on Ir(111) and on graphene. A combination of vibrational spectroscopy and density functional calculations hinted at chemisorbed phthalocyanines on Ir(111), which are considerably deformed. In contrast, phthalocyanines on graphene are physisorbed. Here, the free-molecule properties are preserved during the adsorption. As a consequence, graphene on Ir(111) is an interjacent buffer layer that efficiently reduces the phthalocyanine-Ir hybridization. The third part of the investigations deals with the detection of electrostatic dipole interactions via molecules adsorbed on metal surfaces. Experimentally, carbon monoxide (CO) was deposited on Ir(111) and served as a probe molecule. By coadsorbing phthalocyanines with increasing coverage, the C-O stretch vibrational energy exhibited a gradual decrease and the C-O spectroscopic line shape becomes asymmetric. Calculations trace these observations to electrostatic dipole interactions between CO and phthalocyanine dipoles." @default.
- W2800511312 created "2018-05-17" @default.
- W2800511312 creator A5064462193 @default.
- W2800511312 date "2016-07-12" @default.
- W2800511312 modified "2023-09-24" @default.
- W2800511312 title "Phonons of epitaxially grown graphene on Ir(111) and molecular vibrational excitations studied by angle-resolved electron energy loss spectroscopy" @default.
- W2800511312 hasPublicationYear "2016" @default.
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