TY - GEN A1 - Bignardi, Luca A1 - Lizzit, Daniel A1 - Bana, Harsh A1 - Travaglia, Elisabetta A1 - Lacovig, Paolo A1 - Sanders, Charlotte E. A1 - Dendzik, Maciej A1 - Michiardi, Matteo A1 - Bianchi, Marco A1 - Ewert, Moritz A1 - Buß, Lars A1 - Falta, Jens A1 - Flege, Jan Ingo A1 - Baraldi, Alessandro A1 - Larciprete, Rosanna A1 - Hofmann, Philip A1 - Lizzit, Silvano T1 - Growth and structure of singly oriented single-layer tungsten disulfide on Au(111) T2 - Physical Review Materials N2 - A singly oriented, single layer of tungsten disulfide (WS2) was epitaxially grown on Au(111) and characterized at the nanoscale by combining photoelectron spectroscopy, photoelectron diffraction, and low-energy electron microscopy. Fast x-ray photoelectron spectroscopy revealed that the growth of a single crystalline orientation is triggered by choosing a low W evaporation rate and performing the process with a high temperature of the substrate. Information about the single orientation of the layer was obtained by acquiring x-ray photoelectron diffraction patterns, revealing a 1H polytype for the WS2 layer and, moreover, determining the structural parameters and registry with the substrate. The distribution, size, and orientation of the WS2 layer were further ascertained by low-energy electron microscopy. KW - tungsten disulfide (WS2) KW - Au (111) KW - photoelectron spectroscopy KW - photoelectron diffraction KW - low-energy electron microscopy Y1 - 2019 U6 - https://doi.org/10.1103/PhysRevMaterials.3.014003 SN - 2475-9953 VL - 3 IS - 1 ER - TY - JOUR A1 - Wieprecht, Wolfgang A1 - Stieler, M. A1 - Heinze, G. A1 - Möller, Detlev A1 - Riebel, Ulrich A1 - Hofmann, E. A1 - Sparmann, A. A1 - Kalaß, Dieter A1 - Acker, Karin A1 - Auel, Renate T1 - Droplet concentrations (LWC) and its chemical composition after gas cleaning in the lignite firwed power plant Jänschwalde (FRG) Y1 - 1998 ER - TY - GEN A1 - Noatschk, Katharina A1 - Hofmann, E. V. S. A1 - Dabrowski, J. A1 - Curson, N. J. A1 - Schröder, Thomas A1 - Klesse, Wolfgang Matthias A1 - Seibold, Götz T1 - Ge(001) surface reconstruction with Sn impurities T2 - Surface Science N2 - Defects play an important role for surface reconstructions and therefore also influence the substrate growth. In this work we present a first principle calculation for the Ge(001) surface without and with tin impurities incorporated into the top surface layer. By mapping the system onto an Ising-type model, with interaction constants taken from density functional theory, the stability of the surface reconstructions under the influence of different concentrations of tin impurities is explored. This approach allows us to simulate the possible phase transitions for the different surface reconstructions including the local structure around the tin impurity atoms. In addition, we compare our theoretical results with experimental STM images on clean and Sn-doped Ge(100) surfaces. KW - Gesn KW - DFT KW - Monte carlo simulations KW - Surface reconstruction KW - Impurities Y1 - 2021 UR - https://www.sciencedirect.com/science/article/pii/S0039602821001163?dgcid=author U6 - https://doi.org/10.1016/j.susc.2021.121912 VL - 713 SP - 1 EP - 8 ER -