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- W2989595907 abstract "This thesis comprises low temperature UHV STM and STS experiments. Firstly, the electronic structure of decorated Ag(111) surfaces is explored, with focus on quasielectron lifetimes in Shockley surface states, made accessible by constructing monatomicallydeep hexagonal and triangular surface vacancies, by argonion bombardment and tip-substrate impact.Within the resonators, the surface electrons are confined tobroadened standing wave states, described well by aparticle-in-a-box model. The linewidths show an approximatelylinear increase with binding energy. The two main contributionsidentified are the intrinsic lifetime, due to electron-electronand electron-phonon interaction, and lossy scattering at theboundary.An estimate of the relative strength shows that the latter isthe limiting factor for lifetime. Comparison of various previouslypublished lifetime data yields a consistent picture.Supplemental experiments on one-dimensional atomicchains and vacancy rows yield the surface state dispersion, anda transmission resonance peak at 1.7 V on the chain.Comparison to adsorbed Ag oligomers shows a decrease in energywith cluster size. Fowler-Nordheim spectroscopy finds a reduced sample work function on the nanostructures.The second part explores the adsorption characteristics of submonolayers of the perylene-3,4,9,10-tetracarboxylic-dianhydride (PTCDA) molecule on the vicinal Au(111) surfaces Au(788), Au(433), and Au(877). Substrate areas with a highstep density prefer formation of molecular chains along the steps,with a strong preference for {111} type steps.Otherwise island formation in the known herringbone andsquare phases is seen. With increasing sample bias,the molecules undergo a contrast transition in STM, at an energyshifted by 0.35 V between the two phases. A DFT calculation suggeststhat the transition correlates to the LUMO, and the shiftis due to a variation in intermolecular hydrogen bond strength." @default.
- W2989595907 created "2019-12-05" @default.
- W2989595907 creator A5068689133 @default.
- W2989595907 date "2018-05-22" @default.
- W2989595907 modified "2023-09-24" @default.
- W2989595907 title "Scanning Tunneling Studies on Patterned Noble Metal (111) Substrates" @default.
- W2989595907 hasPublicationYear "2018" @default.
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