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Presentations

 

2011

 

  • The electronic structure of bottom-up fabricated graphene nanoribbons on Au(111)
    C. Bronner, F. Leyssner, S. Meyer, and P. Tegeder
    European conference on surface science (ECOSS 28), Wroclaw, Poland, 2011

  • Acombined scanning tunneling microscopy and two-photon photoemission study on octithiophene on  Au(111)
    E. Varene, L. Bogner, Y. Pennec, and P. Tegeder
    European conference on surface science (ECOSS 28), Wroclaw, Poland, 2011

  • Optically and Thermally Induced Switching of Molecules on Metal Surfaces
    Petra Tegeder
    International workshop on     Elementary Processes in Solids and at Interfaces, Kloster Banz, Bad Staffelstein, Germany, 2011

  • Electronic structure of bottom-up fabricated graphene nanoribbons at the gold surface
    C. Bronner, F. Leyssner, S. Meyer, and P. Tegeder
    International workshop on Elementary Processes in Solids and at Interfaces, Kloster Banz, Bad Staffelstein, Germany, 2011

  • Coverage and temperature dependent isomerization of tetra-tert-butyl-imine on Au(111)
    F. Leyssner, M. Koch, S. Meyer, Y. Luo, R. Haag, and P. Tegeder
     International workshop on Elementary Processes in Solids and at Interfaces, Kloster Banz, Bad Staffelstein, Germany, 2011

  • Elementary processes of organic photovoltaics probed by two-photon photoemission. Varene, I. Martin, C. Bronner, L. Bogner, and P. Tegeder
    Bunsentagung Berlin, Germany, 2011

  • Coverage and temperature dependent isomerization of tetra-tert-butyl-imine on Au(111)
    F. Leyssner, M. Koch, S. Meyer, Y.Luo, R. Haag, and P. Tegeder
    Bunsentagung Berlin, Germany, 2011

  • Electronic Structure of a Spiropyran Derived Molecular Switch in Direct Contact with the Au(111) Surface
    Bronner    , Gunnar Schulze, Katharina J. Franke, José Ignacio Pascual, and Petra Tegeder
    DPG-Meeting, Dresden, Germany, 2011

  • Coverage and temperature driven isomerization of TBI on Au(111)
    C. Gahl, D. Brete, R. Carley, R. Schmidt, E. R. McNellis, K. Reuter, P. Tegeder, J Mielke, L Grill, and M. Weinelt
    DPG-Meeting, Dresden, Germany, 2011

  • Exciton dynamics at oligothiophene/Au(111) interfaces
    Erwan Varene    , Isabel Martin, Christopher Bronner, Lea Bogner, and Petra Tegeder
    DPG-Meeting, Dresden, Germany, 2011

  • Coverage dependent isomerisation behaviour of tetra-tertbutyl-imine on Au(111)
    Felix Leyssner, Matthias Koch, Stephan Meyer, and Petra Tegeder
    DPG-Meeting, Dresden, Germany, 201

 

 

 

2010

 

  • Electron dynamics in thiophene based materials probed by two-photon photoemission
    E. Varene, I. Martin, C. Bronner, M. Wolf, and P. Tegeder
    European Optical Society Annual Meeting, Paris, France, 2010

  • Elementary processes in organic photovoltaics probed by two-photon photoemission
    E. Varene, I. Martin, C. Bronner, M. Wolf, and P. Tegeder
    Polymers in Biomedicine and Electronics - Biannual Meeting of the GDCh-Division of "Macromolecular Chemistry" and Polydays, Berlin, Germany, 2010

  • Charge carrier dynamics in an organic semiconductor probed by two-photon photoemission: Sexithiophene on Au(111)
    E. Varene, I. Martin, C. Bronner, M. Wolf, and P. Tegeder
    European conference on surface science (ECOSS 27), Groningen, Netherlands, 2010

  • Benchmarking semiempirical dispersion correction approaches: structure and energetics of azobenzene derivatives on Ag(111)
    G. Mercurio, E.R. Mcnellis, I. Martin, S. Hagen, F. Leyssner, S. Soubatch, J. Meyer, M. Wolf, P. Tegeder, K. Reuter, F.S. Tautz
    European conference on surface science (ECOSS 27), Groningen, Netherlands, 2010

  • Electronic structure and charge carrier dynamics at oligothiophene/Au(111) interfaces
    Erwan Varene and Petra Tegeder
    Gordon Research Conference: "Electronic processes in organic materials"; Mount Holyoke College, South Hadley, MA, USA, 2010

  • Benchmarking semiempirical dispersion correction approaches: structure and energetics of azobenzene derivatives on Ag(111)
    G. Mercurio, E.R. Mcnellis, I. Martin, S. Hagen, F. Leyssner, S. Soubatch, J. Meyer, M. Wolf, P. Tegeder, K. Reuter, F.S. Tautz
    18th International Vacuum Congress (IVC-18), Beijing, China, 2010

  • Photoinduced isomerization of molecular switches at metal surfaces
    Petra Tegeder
    DPG-Meeting, Regensburg, Germany, 2010
    (invited talk)

  • Reversible photoisomerization of an azobenzene functionalized self-assembled monolayer probed by sum frequency generation vibrational spectroscopy
    Felix Leyssner, Steffen Wagner, Christian Kördel, Sebastian Zarwell, Karola Rück-Braun, Martin Wolf, and Petra Tegeder
    DPG-Meeting, Regensburg, Germany, 2010

  • Electronic structure and charge carriers dynamics in sexithiophene absorbed on Au(111)
    Erwan Varene, Isabel Martin, Martin Wolf, and Petra Tegeder
    DPG-Meeting, Regensburg, Germany, 2010

  • Optical Isomerization of tetra-tert -butyl-azobenzene (TBA) on Gold (111) and Coverage Dependent Conformation of the Corresponding Imine
    Daniel Brete, Roland Schmidt, Cornelius Gahl, Robert Carley, Sebastian Hagen, Petra Tegeder, and Martin Weinelt
    DPG-Meeting, Regensburg, Germany, 2010

  • Structure and energetics of azobenzene on Ag(111)
    Giuseppe Mercurio, Erik McNellis, Isabel Martin, Sebastian Hagen, Felix Leyssner, Sergey Soubatch, Jörg Meyer, Martin Wolf, Petra Tegeder, Frank Stefan Tautz, and Karsten Reuter
    DPG-Meeting, Regensburg, Germany, 2010

  • Charge carrier dynamics at the sexithiophene/Au(111) interface
    Erwan Varene, Isabel Martin, Martin Wolf, and Petra Tegeder
    APS March Meeting, Portland, Oregon, USA, 2010


2009

 

  • Adsorption geometry of molecular switches
     G. Mercurio, S. Subach, S. Hagen, F. Leyssner, E. McNellis, K. Reuter, P. Tegeder, S. F. Tautz
    10th International Conference on Atomically Controlled Surfaces, Interfaces and Nanostructures (ACSIN-10), Granada, SPAIN, 2009

  • Probing photoinduced reversible switching of an azobenzenefunctionalized SAM using
    sum-frequency generation vibrational spectroscopy
    F. Leyssner, S. Wagner, C. Kördel, S. Zarwell, K. Rück-Braun, M. Wolf, and P. Tegeder
    European conference on surface science (ECOSS 26), Parma, Italy 2009

  • Optically and thermally induced isomerization of a molecular switch in direct contact with a metal surface
     Sebastian Hagen, Felix Leyssner, Martin Wolf, and Petra Tegeder
    European conference on surface science (ECOSS 26), Parma, Italy 2009
    (talk)

  • Molecular Switching Processes at Metal Surfaces
     Petra Tegeder
    Universität Konstanz, Fachbereich Physik, Physikalisches Kolloquium, 2009
    (talk)

  • Molecular chemistry at surfaces: Ring opening reaction of Spiropyrane molecules on a metal surface
    G. Schulze, M. Piantek, J. Miguel, M. Koch, F. Leyssner, K.J. Franke, P. Tegeder, W. Kuch,
    J.I. Pascual
    DPG-Meeting, Dresden, Germany, 2009

  • Structure-function relation in the photoswitch tetra-tert-butyl-azobenzene on Au(111)
    R. Schmidt, D. Brete , S. Hagen, R. Carley , C. Gahl, P. Tegeder, and M. Weinelt
    DPG-Meeting, Dresden, Germany, 2009


2008

 

  • Molecular switching at metal surfaces.
    S. Hagen, F. Leyssner, M. Wolf, and P. Tegeder
    ESF-Conference: Chemical Control with Electrons and Photons; Obergrugl/ Österreich 2008
    (invited talk)

  • Reversible changes in the vibrational structure of tetra-tert-butyl-imine on a Au(111)-surface induced by light and thermal activation
    Felix Leyssner, Matthias Koch, Martin Wolf, Petra Tegeder
    ESF-Conference: Chemical Control with Electrons and Photons; Obergrugl/Österreich 2008

  • Isomerization of azobenzene derivatives adsorbed on a Au(111) surface
     Petra Tegeder
    Seminar Kurzzeitspektroskopie von Molekülen, Clustern und Grenzflächen, Max-Born-Institut, Berlin, 2008
    (talk)

  • Molecular Switching at surfaces
    Petra Tegeder
    Forschungszentrum Jülich, 2008
    (talk)

  • Reversible switching of an azobenzene derivative in direct contact with a metal surface
     S. Hagen, F. Leyssner, P. Kate, M. Wolf, and P. Tegeder
    Low-Energy Electron Molecule Interaction-Electron Induced Processes At the Molecular Level (LEEMI-EIPAM 2008); Roscoff, France, 2008
    (invited talk)

  • Reversible isomerization of an azobenzene derivative on Au(111) probed by two-photon photoemission
    Sebastian Hagen, Felix Leyssner, Peter Kate, Martin Wolf, Petra Tegeder
    Electron Contolled Chemical Lithography (ECCL), Lisbon, Portugal, 2008

  • Reversible switching of azobenzene in direct contact with a Au(111) surface
    Sebastian Hagen, Peter Kate, Felix Leyssner, Martin Wolf, Petra Tegeder
    DPG-Tagung, Berlin 2008

  • Reversible switching of tetra-tert-butyl-azobenzene on Au(111): A vibrational analysis
    László Óvári, Martin Wolf, Petra Tegeder
    DPG-Tagung, Berlin 2008

  • Molecular switches at surfaces: Reversible isomerization on an azobenzene derivatives
    Petra Tegeder
    Sfb 677 "Funktion durch Schalten"- Seminar; Universität Kiel, 2008
    (talk)



2007-2006

 

  • Isomerization of azobenzene on a Au(111) surface
    Petra Tegeder
    Seminar on Theoretical Chemistry; Universität Potsdam, Department of Chemistry 2007
    (talk)

  • Reversible switching of tetra-tert-butyl-azobenzene on a Au(111) surface induced by light and thermal activation
    P. Tegeder, S. Hagen, L. Óvári, F. Leyssner, D. Nandi, P. Kate, and M. Wolf
    International Workshop on Molecular switches at surfaces, Zeuthen/Germany 2007
    (invited talk)

  • Reversible switching of tetra-tert-butyl-azobenzene molecules on Au( 111) induced by light and thermal activation
    Petra Tegeder
    Seminar on "Molekulare Physik und Chemie an Oberflächen"; FU-Berlin, Department of Physics 2007
    (talk)

  • Reversible switching of tetra-tert-butyl- azobenzene on a Au(111) surface induced by light and thermal activation
    Petra Tegeder
    Colloquium on Elementary Processes in Molecular Switches at Surfaces; FU Berlin 2007
    (talk)

  • The molecular switch tetra-tert-butyl-azobenzene adsorbed on noble metals: Electronic structure and reversible switching
    Petra Tegeder, Sebastian Hagen, Felix Leyßner, and Martin Wolf
    Electron Induced Processes At the Molecular Level (EIPAM 2007) Hveragerði, Iceland 2007

  • Evolution of Negative Ion Resonances at Surfaces: Effect of Environment and Orientation
    Petra Tegeder
    The Fifth EU-Japan Joint Symposium on Plasma Processing; Radicals and Non-Equilibrium Processes in Low-Temperature Plasmas; Belgrade, Serbia 2007
    (invited talk)

  • Molecular Switches at Surfaces: Optical Induced Charge Transfer and Molecular Orientation
    Petra Tegeder
    Seminar on Electron and Photon Driven Reactions; FU-Berlin, Department of Chemistry 2007
    (talk)

  • Molekulare Schaltprozesse an Halbleiteroberflächen: Optisch induzierter Ladungstransfer und molekulare Orientierung
    Petra Tegeder
    Workshop: Molekulare Schalter an Oberflächen –Stand und Perspektive; Berlin 2006
    (talk)

2005-2003

 

  • Switching Processes on Semiconductor Surfaces: Status and Prospect
    Petra Tegeder
    Colloquium on Elementary Processes in Molecular Switches at Surfaces; FU Berlin 2005
    (talk)

  • Molekular Switches on Surfaces: Cyclooctatetraene on Ru(001).
     Petra Tegeder
     Universität Bremen, Department of Physical Chemistry (2005)
    (invited talk)

  • Structural transition in Cyclooctatetraene adsorbed on Ru(001) probed by thermal desorption and two-photon photoemission spectroscopy.
    P. Tegeder, M. Danckwerts, S. Hagen, and M. Wolf
    DPG-Frühjahrstagung 2005, Berlin
    (talk)

  • Electron dynamics in molecular switches on surfaces: Cyclooctatetraene on Ru(001) and Si(001)-H.
    Petra Tegeder, Matthias Danckwerts, Sebastian Hagen, and Martin Wolf
    332th Heraeus Seminar; Processes Driven by Low Energy Electron-Molecule Interactions; Bad Honnef/Germany 2004
    (invited talk)


  • Inelastic scattering and stopping power for electrons in O2 and O3.
    A. Williart, P. A. Kendall, F. Blanco, P. Tegeder, G. García, and N. J. Mason
    XXIII. International Conference on Photonic, Electronic, and Atomic Collisions (ICPEAC XXII), Stockholm/Schweden 2003


2002

 

  • Electron stimulated desorption of anions from atmospharically relevant species.
    Petra Tegeder, Richard Balog, Nigel J. Mason, and Eugen Illenberger
    2nd International Symposium on Low Energy Electron-Molecule Interactions (LEEMI 2002), Siedlce/Poland 2002
    (invited talk)

  • Study of Trifluoromethyl Sulphur Pentafluoride Using FTIR and VUV Spectroscopy.
    Gareth Buchanan, George Marston, Paul Kendall, Nigel Mason, Petra Tegeder, Anita Dawes, Sam Eden, David Newnham
    XXV Informal Conference on Photochemistry, Florida/USA 2002

  • Study of trifluoromethyl sulphur pentafluoride using FTIR and VUV spectroscopy.
    Buchanan, G., G. Marston, P. Kendall, N. Mason, P. Tegeder, A. Dawes, S. Eden, D. Newnham
    UTLS OZONE/COSMAS Science Meeting, Bristol/UK 2002

  • Electron scattering from molecular systems relevant to plasma industry: a combined experimental and theoretical study.
    N J Mason, S Eden, P Kendall, P Tegeder and P Limão Vieira
    International Conference on Current Developments in Atomic, Molecular and Chemical Physics with Applications (cdamcp 2002), Delhi/India, 2002

  • Collisional and Photon Induced Synthesis within Ice Mantles.
    N.J. Mason, A. Dawes, P. Tegeder and P. Holtom
    XIII. Symposium on Atomic, Cluster and Surface Physics (SASP 2002), Going (Kitzbühel, Tirol)/Austria 2002

  • Electron and Photon Impact Studies of CF3I.
    N.J. Mason, S. Eden, P. Limao Vieira, P. Kendall. S. Pathak, A. Dawes, P. Tegeder, M. Kitajima, M. Okamoto, H. Tanaka, S. Samukawa, H. Cho, and S. Hoffmann
    XIII. Symposium on Atomic, Cluster and Surface Physics (SASP 2002), Going (Kitzbühel, Tirol)/Austria 2002


2001

 

  • Electron Stimulated Desorption from Condensed XCN (X = Cl, Br): State Selectivity in the Desorption Spectra of Fragment Anions.
    Petra Tegeder and Eugen Illenberger
    XXII. International Conference on Photonic, Electronic, and Atomic Collisions (ICPEAC XXII), Santa Fe, New Mexico/USA 2001

  • Electron scattering by ozone at intermediate and high energy, 50-5000 eV.
    F. Blanco, A. Williart, J.L de Pablos, G. García, P.A .Kendall, P. Tegeder, and N.J. Mason
     XXII. International Conference on Photonic, Electronic, and Atomic Collisions (ICPEAC XXII), Santa Fe, New Mexico/USA 2001

  • High Resolution Electron Attachment to C2Cl4, H2 and Cl2O.
     H. Drexel, W. Sailer, T. Fiegele, G. Senn, N.J. Mason, P. Tegeder, A. Stamatovic, T.D. Märk and P. Scheier
    XXII. International Conference on Photonic, Electronic, and Atomic Collisions (ICPEAC XXII), Santa Fe, New Mexico/USA 2001

  • Experimental Study of Molecular Synthesis in the Interstellar Medium and Polar Stratospheric Clouds.
     Anita Das, Petra Tegeder and Nigel J. Mason
    XXII. International Conference on Photonic, Electronic, and Atomic Collisions (ICPEAC XXII), Santa Fe, New Mexico/USA 2001

  • Electron Stimulated Desorption of O- and O2- from Condensed Ozone.
     Petra Tegeder, Martin Penno, Paul A. Kendall, Nigel J. Mason and Eugen Illenberger
    International Symposium on Electron-Molecule Collisions and Swarms (EMS-01), Lincoln, Nebraska/USA 2001
    (invited talk)

  • Modification of an NF3 film by sub-excitation electrons.
    Petra Tegeder and Eugen Illenberger
    International Symposium on Electron-Molecule Collisions and Swarms (EMS-01), Lincoln, Nebraska/USA 2001

  • Laboratory Synthesis of Interstellar Molecules
    A. Dawes, P. Tegeder, and N.J. Mason
    Meeting on Novel Experimental and Theoretical Techniques, London 2001

  • Laboratory Studies of Formation of Prebiotic Molecules in the Interstellar Medium.
    A. Das, P. Tegeder, and N.J. Mason
    IOP poster competition, London 2001

  • Laboratory Studies of Electron and Photon Molecular Synthesis within Icy Mantles.
    Anita Das, Petra Tegeder and Nigel J. Mason
    7th European Conference on Atomic and Molecular Physics (ECAMP VII), Berlin/Germany 2001

  • Electron Attachment to Cl2O.
    Wolfgang Sailer, H. Drexel, V. Grill, P. Tegeder, N.J. Mason, P. Scheier and T.D. Märk
    7th European Conference on Atomic and Molecular Physics (ECAMP VII), Berlin/Germany 2001

  • High-resolution electron ionization study of molecules and clusters: appearance energies.
     G. Hanel, T. Fiegele, M. Lezius, I. Torres, P. Tegeder, N. Mason, M. Farizon, B. Farizon, A. Stamatovic, P Scheier and T.D. Märk
    7th European Conference on Atomic and Molecular Physics (ECAMP VII), Berlin/Germany 2001

  • Anion Formation in the Low-Energy Electron Impact to Dichlorine Monoxide.
     Petra Tegeder, Wolfgang Sailer, Herwig Drexel, Martina Meinke, Eckart Ruehl, Tilmann D. Märk, Nigel J. Mason and Eugen Illenberger
    7th European Conference on Atomic and Molecular Physics (ECAMP VII), Berlin/Germany 2001

  • Formation and Evolution of Negative Ion Resonances in Condensed Ozone.
     Petra Tegeder, Martin Penno, Paul A. Kendall, Nigel J. Mason and Eugen Illenberger
    7th European Conference on Atomic and Molecular Physics (ECAMP VII), Berlin/Germany 2001

  • Anion Formation in the Low Energy Electron Impact to H2, Cl2O and C2Cl4.
     W. Sailer, H. Drexel, T. Fiegele, V. Grill, G. Senn, N.J. Mason, P. Tegeder, A. Stamatovic, P. Scheier and T.D. Märk;
    1st International Symposium on Low Energy Electron-Molecule Interactions (LEEMI 2001), Going (Kitzbuehel, Tirol)/Austria 2001

  • Electron Stimulated Desorption of Anions from Condensed Ozone.
    Petra Tegeder, Martin Penno, Paul A. Kendall, Nigel J. Mason and Eugen Illenberger
    1st International Symposium on Low Energy Electron-Molecule Interactions (LEEMI 2001), Going (Kitzbuehel, Tirol)/Austria 2001

  • Modification of thin molecular films by sub-excitation electrons.
     Petra Tegeder and Eugen Illenberger
    1st International Symposium on Low Energy Electron-Molecule Interactions (LEEMI 2001), Going (Kitzbuehel, Tirol)/Austria 2001

  • Experimental Study of the Synthesis of Prebiotic Molecules in the Interstellar Medium.
    A. Das, P. Tegeder and N.J. Mason
    1st International Symposium on Low Energy Electron-Molecule Interactions (LEEMI 2001), Going (Kitzbuehel, Tirol)/Austria 2001


2000-1996

 

  • Electron Stimulated Desorption of O- from Condensed Ozone.
    Petra Tegeder, Paul A. Kendall, Martin Penno, Nigel J. Mason and Eugen Illenberger
    Tag der Chemie-Wissenschaft trifft Industrie, Berlin/Germany 2000

  • Modifikation von molekularen Filmen mit langsamen Elektronen.
     Petra Tegeder and Eugen Illenberger
    Bunsentagung, Würzburg/Germany 2000
    (talk)

  • Electron Induced Reactions in Thin Molecular Films.
    Petra Tegeder
    1st Indian and UK Scientific Workshop, University College London/UK 2000
    (invited talk)

  • Modifikation von Oberflächen mit Sub-Ionisations-Elektronen.
    Petra Tegeder and Eugen Illenberger;
    Tag der Chemie-Wissenschaft trifft Industrie, Berlin/Germany 1999
    (talk)

  • Generation and Evolution of Negative Ions at a Surface.
     Petra Tegeder and Eugen Illenberger
    12th Symposium on Application of Plasma Processes, Liptovsky Ján/Slovakia 1999
    (invited talk)

  • Electron Stimulated Desorption of Anions from Condensed and Adsorbed NF3.
     P. Tegeder and E. Illenberger
    12th European Symposium on Fluorine Chemistry, Berlin/Germany 1998

  • Electron-Stimulated-Desorption (ESD) and Infrared-Reflection-Absorption-Spectroscopic (IRAS) Analysis of Adsorbed CF4 Molecules.
     Petra Tegeder and Eugen Illenberger
    European Sectional Conference on the Atomic and Molecular Physics of Ionised Gases (ESCAMPIG), Malahide/Ireland 1998

  • Elementary Reactions Related to Plasmas: Electron Capture by Free and Bound Molecules.
     P. Tegeder, F. Brüning and E. Illenberger
    11th Symposium on Elementary Processes and Chemical Reactions in Low Temperature Plasma, Low Tatras/Slovakia 1998 (invited lecture)

  • Electron-Stimulated-Desorption (ESD) and Infrared-Reflection-Absorption-Spectroscopic (IRAS) Analysis of Adsorbed Halogenated Molecules.
     P. Tegeder, J. Langer and E. Illenberger
    European Research Conference on Cluster-Surface-Interactions, Cargese/Corsica 1998

  • Electron Attachment to XCN (X=Br, Cl). Competition between X - and CN - Formation at Different Gas Temperatures.
    F. Brüning, P. Tegeder and E. Illenberger
    173. WE-Heraeus-Seminar: Low Energy Electron-Molecules Interactions at Different Degrees of Aggregation, Bad Honnef/Germany 1997

  • Electron Attachment to Triatomic Pseudohalogenes at Different Gas Temperatures.
     F. Brüning, I. Hahndorf, P. Tegeder and E. Illenberger
    International Symposium on Electron-Molecules-Collisions and Ion and Electron Swarm. A Satellite of the XX ICPEAC, Engelberg/Switzerland 1997

  • Low-Energy Electron Capture Reactions of XCN (X=Br, Cl) at Different Gas Temperatures.
     F. Brüning, P. Tegeder and E. Illenberger
    14th International Mass Spectrometry Conference (IMSC), Tampere/Finnland 1997

  • The Reactivity of Slow Electrons with Molecules at Different Stages of Aggregation.
    Petra Tegeder, Lars Lehmann, Oddur Ingolfsson, Fritz Weik und Eugen Illenberger
    European Sectional Conference on the Atomic and Molecular Physics of Ionised Gases (ESCAMPIG), Poprad/Slovakia 1996

  • Ungewöhnlich starke Solvatationseffekte bei der Reaktivität langsamer Elektronen mit Molekülen.
     P. Tegeder, L. Lehmann, O. Ingolfsson, F. Weik und E. Illenberger
    Bunsentagung, Jena/Germany 1996
     (talk)