@article{23498, abstract = {{The ultrafast dynamics of photoexcitations at silicon surfaces is investigated using a surface-sensitive purely optical technique. In the experiments, the diffracted second harmonic generated by sequences of ultrashort laser pulses is detected as a function of the time delay between the pulses. It is demonstrated that this five-wave-mixing technique can be used to measure the temporal evolution of the optical polarization and the photoexcited populations at the surface. The experimental results can be reproduced by numerical solutions of optical Bloch equations. The theoretical analysis allows one to investigate which dephasing times and relaxation processes are compatible with experiment. Furthermore, it is outlined how one can describe optical nonlinearities at surfaces using a microscopic theory within the framework of semiconductor Bloch equations.}}, author = {{Meier, Torsten and Reichelt, Matthias and Koch, S W and Höfer, U}}, issn = {{0953-8984}}, journal = {{Journal of Physics: Condensed Matter}}, number = {{8}}, pages = {{S221--S244}}, title = {{{Femtosecond time-resolved five-wave mixing at silicon surfaces}}}, doi = {{10.1088/0953-8984/17/8/003}}, volume = {{17}}, year = {{2005}}, } @article{23499, abstract = {{The ultrafast dynamics of photoexcitations at silicon surfaces is investigated using a surface-sensitive purely optical technique. In the experiments, the diffracted second harmonic generated by sequences of ultrashort laser pulses is detected as a function of the time delay between the pulses. It is demonstrated that this five-wave-mixing technique can be used to measure the temporal evolution of the optical polarization and the photoexcited populations at the surface. The experimental results can be reproduced by numerical solutions of optical Bloch equations. The theoretical analysis allows one to investigate which dephasing times and relaxation processes are compatible with experiment. Furthermore, it is outlined how one can describe optical nonlinearities at surfaces using a microscopic theory within the framework of semiconductor Bloch equations.}}, author = {{Meier, Torsten and Reichelt, Matthias and Koch, S W and Höfer, U}}, issn = {{0953-8984}}, journal = {{Journal of Physics: Condensed Matter}}, number = {{8}}, pages = {{S221--S244}}, title = {{{Femtosecond time-resolved five-wave mixing at silicon surfaces}}}, doi = {{10.1088/0953-8984/17/8/003}}, volume = {{17}}, year = {{2005}}, } @inproceedings{44297, author = {{Meier, Torsten and Reichelt, Matthias and Pasenow, B. and Stroucken, T. and Koch, S.W.}}, booktitle = {{2005 annual conference of the German Physical Society (DPG) during the World year of physics}}, location = {{Berlin, Germany}}, title = {{{Optical properties of semiconductor photonic-crystal structures: spatially-inhomogeneous excitonic resonances and optical gain}}}, volume = {{40}}, year = {{2005}}, } @inbook{56461, author = {{Thiel, Ansgar and Teubert, Hilke and Cachay, Klaus}}, booktitle = {{Fußball in Geschichte und Gesellschaft}}, editor = {{Krüger, Michael and Schulze, Bernd}}, pages = {{195--210}}, publisher = {{Czwalina}}, title = {{{Verbundsysteme in der Nachwuchsförderung – Effiziente Kopplung von Spitzensport und Schule als Abstimmungs- und Akzeptanzprobleme}}}, year = {{2005}}, } @article{56462, author = {{Teubert, Hilke and Borggrefe, Carmen and Cachay, Klaus and Thiel, Ansgar}}, journal = {{Sportunterricht}}, pages = {{292--296}}, title = {{{Spitzensport und Schule – Möglichkeiten der strukturellen Kopplung}}}, volume = {{54}}, year = {{2005}}, } @article{56463, author = {{Borggrefe, Carmen and Teubert, Hilke and Cachay, Klaus and Thiel, Ansgar}}, journal = {{Sportunterricht}}, pages = {{297--302}}, title = {{{Spitzensport als Schulprofil?}}}, volume = {{54}}, year = {{2005}}, } @inbook{56465, author = {{Teubert, Hilke and Thiel, Ansgar and Kleindienst-Cachay, Christa}}, booktitle = {{Qualität im Schulsport}}, editor = {{Gogoll, André and Menze-Sonneck, Andrea}}, pages = {{148--153}}, publisher = {{Czwalina}}, title = {{{Die „Bewegte Schule“ auf dem Prüfstand – Qualitätsmerkmale einer grundschulpädagogischen Innovation.}}}, year = {{2005}}, } @article{56460, author = {{Thiel, Ansgar and Teubert, Hilke and Cachay, Klaus}}, journal = {{European Journal for Sport and Society}}, number = {{2}}, pages = {{121--138}}, title = {{{Linking Top Sports and Schools to Foster the Next Generation of Athletes in Competitive Sports – Considerations on the Example of the Integrated Systems}}}, volume = {{2}}, year = {{2005}}, } @inbook{56473, author = {{Teubert, Hilke and Thiel, Ansgar and Halle, Arne and Cachay, Klaus}}, booktitle = {{Spitzensport im Jahr der olympischen Sommerspiele 2004 – Strukturen und Wissen}}, editor = {{Mester, J and Knuth, S}}, pages = {{120--153}}, publisher = {{Meyer & Meyer}}, title = {{{Abstimmung und Akzeptanz der Verbindung von Schule und Leistungssport – Zu den Basisvoraussetzungen effizienter Verbundsysteme}}}, year = {{2005}}, } @article{58598, abstract = {{AbstractA series of bis‐guanidine ligands designed for use in biomimetic coordination chemistry has been extended to a library matrix combining unprecedented substitutional flexibility within the guanidyl residues with a wide range of aliphatic and aromatic spacers connecting these functionalities. The underlying protocol can be used with predefined ureas as well as secondary amines to build up these units by reaction with phosgene if the ureas are otherwise unavailable. In the latter case, the resulting urea intermediates do not have to be isolated as the reaction proceeds further with additional phosgene to yield a chloroformamidinium chloride which is transformed into the bis‐guanidine functionality by subsequent reaction with a suitable primary diamine in the presence of triethylamine as an auxiliary base. This concept has been used to synthesise and characterise more then two dozen different bis‐guanidines based on 12 discrete monoguanidine units and seven different spacers. These spacers have been chosen such that the most important phenotypes have been dealt with and which range from rigid to more flexible scaffolds. In addition to spacers with no metal‐binding capabilities, other species containing further donor functions such as N‐methyldiphenyleneamine or pyridine‐2,6‐diyl have also been used. The substitution patterns of the guanidine residues can be classified into acyclic and cyclic types. Among the cyclic types, one subset is characterised by five‐ or six‐membered heterocycles containing both the amino nitrogen atoms and another one by individual N‐heterocyclic systems for each amino nitrogen. Structurally characterised examples are 2‐{2‐[2‐(tetramethylguanidi­no)ethoxy]ethoxy}‐1‐(tetramethylguanidino)ethane (TMG2doo) in its diprotonated form and 2,2′‐bis[2N‐(1,1′,3,3′‐tetramethylguanidine)]diphenyleneamine (TMG2PA) as wellas N1,N3‐bis(dimorpholinomethylene)propane‐1,3‐diamine (DMorphG2p) as free bases. For the permethylated bis‐guanidine derivatives, the barrier to rotation around the (C=N)guanidine bond has been determined by means of temperature‐dependent EXSY 1H NMR spectroscopy to range between 54 and 79 kJ mol–1 depending on the type of spacer. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)}}, author = {{Herres‐Pawlis, Sonja and Neuba, Adam and Seewald, Oliver and Seshadri, Tarimala and Egold, Hans and Flörke, Ulrich and Henkel, Gerald}}, issn = {{1434-193X}}, journal = {{European Journal of Organic Chemistry}}, number = {{22}}, pages = {{4879--4890}}, publisher = {{Wiley}}, title = {{{A Library of Peralkylated Bis‐guanidine Ligands for Use in Biomimetic Coordination Chemistry}}}, doi = {{10.1002/ejoc.200500340}}, volume = {{2005}}, year = {{2005}}, } @article{58597, abstract = {{AbstractSyntheses and Structure of Chiral Metallatetrahedron Complexes of the Type [Re2(M1PPh3)(M2PPh3)(μ‐PCy2)(CO)7C≡CPh] (M1 = Ag, Au; M2 = Cu, Ag, Au)From the reaction of Li[Re2(μ‐H)(μ‐PCy2)(CO)7(C(Ph)O)] (1) with Ph3AuC≡CPh both benzaldehyde and the trinuclear complex Li[Re2(AuPPh3)(μ‐PCy2)(CO)7C≡CPh] (2a) were obtained in high yield. The complex anion was isolated as its PPh4‐salt 2b. The latter reacts with coinage metal complexes PPh3M2Cl [M2 = Cu, Ag, Au] to give chiral heterometallatetrahedranes of the general formula [Re2(AuPPh3)(M2PPh3)(μ‐PCy2)(CO)7C≡CPh] (M2 = Cu 3a, Ag 3b, Au 3c). The corresponding complex [Re2(AgPPh3)2(μ‐PCy2)(CO)7C≡CPh] (3d) is obtained from the reaction of [Re2(AgPPh3)2(μ‐PCy2)(CO)7Cl] (4) with LiC≡CPh. 3d undergoes a metathesis reaction in the presence of PPh3CuCl giving [Re2(AgPPh3)(CuPPh3)(μ‐PCy2)(CO)7C≡CPh] (3e) and PPh3AgCl. Analogous metathesis reactions are observed when 3c is reacted with PPh3AgCl or PPh3CuCl giving 3a or 3b, respectively. The reaction of 1 with PPh3AuCl gives benzaldehyde and Li[Re2(AuPPh3)(μ‐PCy2)(CO)7Cl] (5a) which upon reaction with PhLi forms the trinuclear complex Li[Re2(AuPPh3)(μ‐PCy2)(CO)7Ph] (6a). Again this complex was isolated as its PPh4‐salt 6b. In contrast to 2b, 6b reacts with one equivalent of Ph3PAuCl by transmetalation to give Ph3PAuPh and PPh4[Re2(AuPPh3)(μ‐PCy2)(CO)7Cl] (5b). The X‐ray structures of the compounds 3a, 3b, 3e and 4 are reported.}}, author = {{Seewald, Oliver and Flörke, Ulrich and Egold, Hans and Haupt, Hans‐Jürgen and Schwefer, Meinhard}}, issn = {{0044-2313}}, journal = {{Zeitschrift für anorganische und allgemeine Chemie}}, number = {{2}}, pages = {{204--210}}, publisher = {{Wiley}}, title = {{{Synthese und Struktur chiraler Heterometallatetrahedrane des Typs [Re2(M1PPh3)(M2PPh3)(μ‐PCy2)(CO)7C≡CPh] (M1 = Ag, Au; M2 = Cu, Ag, Au)}}}, doi = {{10.1002/zaac.200500340}}, volume = {{632}}, year = {{2005}}, } @inbook{36078, author = {{Schlegel-Matthies, Kirsten}}, booktitle = {{Heterogenität als Chance. Vom produktiven Umgang mit Gleichheit und Differenz in der Schule}}, editor = {{Bräu, Karin and Schwerdt, Ulrich}}, pages = {{197–217}}, publisher = {{Lit-Verlag}}, title = {{{Fachdidaktische Perspektiven auf den Umgang mit Heterogenität im haushaltsbezogenen Unterricht}}}, year = {{2005}}, } @article{13709, author = {{Hahn, P. H. and Schmidt, Wolf Gero and Seino, K. and Preuss, M. and Bechstedt, F. and Bernholc, J.}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, pages = {{037404}}, title = {{{Optical Absorption of Water: Coulomb Effects versus Hydrogen Bonding}}}, doi = {{10.1103/physrevlett.94.037404}}, volume = {{94}}, year = {{2005}}, } @article{13706, author = {{Hermann, A. and Schmidt, Wolf Gero and Bechstedt, F.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, title = {{{Optical response ofπ-conjugated molecular monolayer adsorbed on the semiconductor Si(001) surface: A first-principles study}}}, doi = {{10.1103/physrevb.71.153311}}, volume = {{71}}, year = {{2005}}, } @article{13699, author = {{Hahn, P. H. and Seino, K. and Schmidt, Wolf Gero and Furthmüller, J. and Bechstedt, F.}}, issn = {{0370-1972}}, journal = {{physica status solidi (b)}}, number = {{13}}, pages = {{2720--2728}}, title = {{{Quasiparticle and excitonic effects in the optical spectra of diamond, SiC, Si, GaP, GaAs, InP, and AlN}}}, doi = {{10.1002/pssb.200541128}}, volume = {{242}}, year = {{2005}}, } @article{13700, author = {{Esser, N. and Rakel, M. and Cobet, C. and Schmidt, Wolf Gero and Braun, W. and Cardona, M.}}, issn = {{0370-1972}}, journal = {{physica status solidi (b)}}, number = {{13}}, pages = {{2601--2609}}, title = {{{VUV-ellipsometry on GaN: Probing conduction band properties by core level excitations}}}, doi = {{10.1002/pssb.200541315}}, volume = {{242}}, year = {{2005}}, } @article{13696, author = {{Bechstedt, F. and Seino, K. and Hahn, P. H. and Schmidt, Wolf Gero}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{24}}, title = {{{Quasiparticle bands and optical spectra of highly ionic crystals: AlN and NaCl}}}, doi = {{10.1103/physrevb.72.245114}}, volume = {{72}}, year = {{2005}}, } @article{13705, author = {{Leitsmann, R. and Schmidt, Wolf Gero and Hahn, P. H. and Bechstedt, F.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, title = {{{Second-harmonic polarizability including electron-hole attraction from band-structure theory}}}, doi = {{10.1103/physrevb.71.195209}}, volume = {{71}}, year = {{2005}}, } @article{13701, author = {{Fuchs, F. and Schmidt, Wolf Gero and Bechstedt, F.}}, issn = {{1520-6106}}, journal = {{The Journal of Physical Chemistry B}}, pages = {{17649--17653}}, title = {{{Initial Stage of Si(001) Surface Oxidation from First-Principles Calculations}}}, doi = {{10.1021/jp0501087}}, volume = {{109}}, year = {{2005}}, } @article{13697, author = {{Ortmann, F. and Schmidt, Wolf Gero and Bechstedt, F.}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, number = {{18}}, title = {{{Attracted by Long-Range Electron Correlation: Adenine on Graphite}}}, doi = {{10.1103/physrevlett.95.186101}}, volume = {{95}}, year = {{2005}}, }