Spektroskopische Untersuchungen von organischen Schichtsystemen auf Metall- und Oxidoberflächen

Es wurde das Reaktionsverhalten an der Grenzfläche von kristallinen, halbleitenden Übergangsmetalloxiden (Nickeloxid, Titandioxid, Strontiumtitanat) und Schichten von organischen Halbleitern aus der Gruppe der Übergangsmetall-Phthalocyanine mittels Photoelektronenspektroskopie untersucht. Es wurde die Art der Wechselwirkung an der Grenzfläche und Einflussfaktoren untersucht

Combination and QCD analysis of charm production cross section measurements in deep-inelastic ep scattering at HERA

Measurements of open charm production cross sections in deep-inelastic ep scattering at HERA from the H1 and ZEUS Collaborations are combined. Reduced cross sections sigma(c (c) over bar)(red) for charm production are obtained in the kinematic range of photon virtuality 2.5 LT = Q(2) LT = 2000 GeV2 and Bjorken scaling variable 3 . 10(-5) LT = x LT = 5 . 10(-2). The combination method accounts for the correlations of the systematic uncertainties among the different data sets. The combined charm data together with the combined inclusive deep-inelastic scattering cross sections from HERA are used as input for a detailed NLO QCD analysis to study the influence of different heavy flavour schemes on the parton distribution functions. The optimal values of the charm mass as a parameter in these different schemes are obtained. The implications on the NLO predictions for W-+/- and Z production cross sections at the LHC are investigated. Using the fixed flavour number scheme, the running mass of the charm quark is determined

Interface interaction of transition metal phthalocyanines with strontium titanate (100)

We study interface properties of CoPcF(x) and FePcF(x) (x = 0 or 16) on niobium-doped SrTiO(3)(100) surfaces using mainly X-ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy. For all studied molecules, a rather complex, bidirectional charge transfer with the oxide substrate was observed, involving both the macrocycle and the central metal atom. For molecules of the first monolayer, an electron transfer to the central metal atom is concluded from transition metal 2p core level photoemission spectra. The number of interacting molecules in the first monolayer on the oxide surface depends on the central metal atom of the phthalocyanine, whereas the substrate preparation has minor influence on the interaction between CoPc and SrTiO(3)(100). Differences of the interaction mechanism to related TiO(2) surfaces are discussed