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1,905 results on '"Freund, H J"'

3. Bending Rigidity of 2D Silica

Author

Büchner, C, Eder, SD, Nesse, T, Kuhness, D, Schlexer, P, Pacchioni, G, Manson, JR, Heyde, M, Holst, B, and Freund, H-J

Subjects
Physical Sciences, Condensed Matter Physics, Mathematical Sciences, Engineering, General Physics, Mathematical sciences, Physical sciences
Abstract

A chemically stable bilayers of SiO_{2} (2D silica) is a new, wide band gap 2D material. Up till now graphene has been the only 2D material where the bending rigidity has been measured. Here we present inelastic helium atom scattering data from 2D silica on Ru(0001) and extract the first bending rigidity, κ, measurements for a nonmonoatomic 2D material of definable thickness. We find a value of κ=8.8  eV±0.5  eV which is of the same order of magnitude as theoretical values in the literature for freestanding crystalline 2D silica.

Published
2018

7. Quantum well states in two-dimensional gold clusters on MgO thin films

Author

Lin, X., Nilius, N., Freund, H. -J., Walter, M., Frondelius, P., Honkala, K., and H/"akkinen, H.

Subjects
Condensed Matter - Materials Science
Abstract

The electronic structure of ultra-small Au clusters on thin MgO/Ag(001) films has been analyzed by scanning tunneling spectroscopy and density functional theory. The clusters exhibit two-dimensional (2D) quantum well states, whose shapes resemble the eigen-states of a 2D electron gas confined in a parabolic potential. From the symmetries of the HOMO and LUMO of a particular cluster, its electron filling and charge state is determined. In accordance to a DFT Bader-charge analysis, aggregates containing up to twenty atoms accumulate one to four extra electrons due to a charge transfer from the MgO/Ag interface. The HOMO - LUMO gap is found to close for clusters containing between 70 and 100 atoms., Comment: 12 pages, 4 figures

Published
2008
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8. The XPS peak structure of condensed aromatic anhydrides and imides

Author

Jung, M., Baston, U., Porwol, T., Freund, H. -J., and Umbach, E.

Subjects
Condensed Matter - Materials Science
Abstract

Photoelectron spectra of aromatic anhydrides and imides like PTCDA (perylene-tetracarboxylic dianhydride), PTCDI (perylene-tetracarboxylic diimide), and NDCA (naphthalene-dicarboxylic anhydride) on smooth single crystal surfaces show complex double peak structures in both the O1s and the anhydride C1s range. The peak intensity ratios cannot be simply explained by different chemical states of the atoms but are strongly influenced by intense shake-up satellites. Semiempirical SDCI calculations can quantitatively reproduce the experimental spectra of multilayers, provided that not only intramolecular but also intermolecular shake-up excitations are taken into account. These calculations give further insight into the process of electronic charge transfers in large organic molecules and molecular films. A variation of the molecular structure by reducing the size of the aromatic part (NDCA instead of PTCDA) or by using different functional groups (PTCDI instead of PTCDA) leads to a reduced donor/acceptor strength and hence to drastically reduced satellite intensities., Comment: 31 pages, 7 figures, 3 tables

Published
2004

13. Mixed Germania-Silica Films on Ru(0001): A combined experimental and theoretical study

Author

Fuhrich, A, Paier, J, Tosoni, S, Leandro Lewandowski, A, Gura, L, Schneider, W, Pacchioni, G, Freund, H, Schneider, W-D, Freund, H-J, Fuhrich, A, Paier, J, Tosoni, S, Leandro Lewandowski, A, Gura, L, Schneider, W, Pacchioni, G, Freund, H, Schneider, W-D, and Freund, H-J

Abstract

Two-dimensional oxide films are potentially useful for future technological applications, but also important objects to study model catalyst systems on the more fundamental side. Here we study silica, germania, and mixed silica-germania films supported on a metal single crystal surface Ru(0001). Those mixed films are interesting objects to systematically modify the properties of silica films, which may be used as membranes or covers for model studies in confined space, due to the modification of the rather stiff silica layers by incorporating germanium atoms replacing silicon atoms. Here we report a combined experimental and theoretical study of such layers, where we show how X-ray photoelectron spectroscopy in combination with LEED and I/V LEEM measurements allow us to judge the formation of such mixed films.

Published
2023

24. Molecules on Clean and Modified Oxide Surfaces

Author

Freund, H.-J., Klüner, T., Wichtendahl, R., Thiel, S., Adelt, M., Drachsel, W., Bäumer, M., Kuhlenbeck, H., Risse, T., Al-Shamery, K., Kampling, M., Hamann, H., Russo, Nino, editor, and Salahub, Dennis R., editor

Published
2000
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30. Concept and Design of the SMART Spectromicroscope at BESSY II

Author

Engel, W., Degenhardt, R., Bradshaw, A. M., Erlebach, W., Ihmann, K., Kuhlenbeck, H., Wichtendahl, R., Freund, H.-J., Schlögl, R., Preikszas, D., Rose, H., Spehr, R., Hartel, P., Lilienkamp, G., Schmidt, Th., Bauer, E., Benner, G., Fink, R., Weiss, M. R., Umbach, E., Thieme, Jürgen, editor, Schmahl, Günter, editor, Rudolph, Dietbert, editor, and Umbach, Eberhard, editor

Published
1998
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36. Electronic Excitations at Oxide Surfaces

Author

Kuhlenbeck, H., Bäumer, M., Bender, M., Cappus, D., Dillmann, B., Ehrlich, D., Rohr, F., Schönnenbeck, M., Seiferth, O., Freund, H.-J., Cardona, Manuel, editor, Fulde, Peter, editor, von Klitzing, Klaus, editor, Queisser, Hans-Joachim, editor, Lotsch, Helmut K. V., editor, Okiji, Ayao, editor, Kasai, Hideaki, editor, and Makoshi, Kenji, editor

Published
1996
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47. Low Energy Excitations and Desorption Dynamics from Oxide Surfaces

Author

Menges, M., Baumeister, B., Al-Shamery, K., Adam, B., Mull, Th., Freund, H.-J., Fischer, C., Weide, D., Andresen, P., Ertl, Gerhard, editor, Gomer, Robert, editor, Mills, Douglas L., editor, Lotsch, Helmut K. V., editor, Burns, Alan R., editor, Stechel, Ellen B., editor, and Jennison, Dwight R., editor

Published
1993
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50. Therapy monitoring

Author

Kühne, I., Ceballos-Baumann, A. O., Conrad, B., Kruggel, F., von Einsiedel, H. Gräfin, Schneider, R., Kluge, R., Willmes, K., Stephan, K. M., Netz, J., Hömberg, V., Schönle, P. W., Schwall, D., Bischoff, C., Machetanz, J., Meyer, B.-U., Pallmann, F., Ohlmann, D., Krick, C., Jäger, H., Nachtigall, W., Schimrigk, K., Forster, J., Meyer, B. U., Bresser, B., Thomas, W., Schmitt, R. M., Mielke, U., Welsch, H. J., Lagler, E., Dillmann, U., Krämer, G., Lüder, G., Hopf, H. C., Haupt, W. F., Borberg, H., Rosenow, F., Stoll, M., Hamann, G., Donauer, E., Steudel, W. I., Elek, J. M., Orfgen, Th., Sieb, J. P., Dengler, R., Strittmatter, M., Holzer, G., Haaß, A., Rose, A., Westarp, M. E., Flügel, R. M., Bartmann, P., Fuchs, D., Hoff-Jörgensen, R., Clausen, D., Westarp, M. P., Kornhuber, H. H., Westphal, K. P., Bauer, J., Laupheimer, H., Hülser, P., Schreiber, H., Baumgärtner, K., Wollinsky, K. H., van Eick, H., Heidenreich, F., Leifeld, L., Benecke, R., Jost, Wolfgang H., Schimrigk, Klaus, Bergemann, N., Baas, H., Demisch, L., Fischer, P.-A., Alesch°, F., Fertl, E., Auff, E., Koos, W., Bauer, B., Schmidt, B., Grau, G., Henschel, S., Braus, Dieter F., Schwechheimer, Karl, Volk, Benedikt, Claus, D., Beck, E., Gmeiner, H. J., Puschmann, E., Brunhölzl, C., Jäger, W., Neundörfer, B., Seitz, R. J., Schlaug, G., Kleinschmidt, A., Reifenberger, G., Wechsler, W., Wirrwar, A., Nebeling, B., Treede, R.-D., Hansen, H. C., Kunze, K., Bufler, J., Toyka, K. V., Maelicke, A., Franke, Ch., Melms, A., Malcherek, G., Link, H., Kalbacher, H., Lindstrom, J., Oksenberg, J., Steinman, L., Müller, C., Platz, T., Denzler, P., Mauritz, K.-H., Binkofski, F., Kunesch, E., Kuhlmann, H., Hefter, H., Freund, H-J., Weindl, A., Boecker, H., Kuwert, T., Mayer, T., Winkler, B., Herzog, H., Feinendegen, L. E., Arnold, G., Eichhorn, T., Mai, N., Gasser, T., Marquard, C., Oertel, W. H., Werhahn, K. J., Fong, J., Rothwell, J. C., Shorvon, S., Thompson, P. D., Marsden, C. D., Elger, C. E., Hefner, G., Güldenberg, V., Meierkord, H., Lightman, St., Trimble, M., Jaspert, A., Spitzer, A., Grehl, H., Henningsen, H., Pause, M., Mundinger, F., Schwab, J., Günther, T., Kaendler, S. H., Enzensberger, W., Fischer, P-A., Raitzig, M., Müller, J., Zinner, J., Kasper, S., Stuerenburg, H. J., Hase, M., Hinse, P., Neunzig, P., Weis, M., Rechlin, T., Hilz, M. J., and Schimrigk, K.

Published
1992
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