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CREATED:20240716T230944Z
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SUMMARY:Special Seminar: Wolf Widdra - Institute of Physics\, Martin-Luther-Universität Halle-Wittenberg: Laser-based double photoemission spectroscopy at surfaces
DESCRIPTION:Abstract: \nWith the recent progress in high-order harmonic generation (HHG) using femtosecond lasers\, laboratory photoelectron spectroscopy with an ultrafast\, widely tunable vacuum-ultraviolet light source has become available. Whereas HHG-based photoemission experiments at kilohertz repetition rates have been severely limited by the space-charge effects in the past\, the new development of compact HHG light sources with megahertz repetition rates allows for efficient photoemission and double photoemission experiments as is demonstrated here [1-7].\nI will present momentum-resolved photoemission experiments with photon energies between 14 and 40 eV that demonstrate the high performance of the setup [3\,4\,6]. In addition\, the combination of two time-of-flight spectrometers with coincidence detection electronics opens the way for efficient and long-term stable double photoemission experiments at variable photon energies [1\,6-8]. For the noble metal (001) surface of Ag\, we present a detailed analysis of double photoemission data and will compare them with similar data for the NiO(001) surface. The electron-electron pair distribution shows a sharp sum-energy onset\, which corresponds to one hole in the Ag 3d band (4.5 eV below the Fermi level) and a second excitation from the Ag sp band. Simultaneously\, an intense energy sharing between the electrons in the pair is visible indicating strong electron-electron correlations [5]. For thin films of C60\, a molecular-orbital resolved correlation energy is determined based on double photoemission data at various photon energies. \nReferences:\n[1]    M. Huth\, C.-T. Chiang\, A. Trützschler\, F. O. Schumann\, J. Kirschner\, and W. Widdra; Applied Physics Letters 104\, 061602 (2014).\n[2]    A. Blättermann\, C.-T. Chiang\, and W. Widdra; Physical Review A 89\, 043404 (2014).\n[3]    C.-T. Chiang\, M. Huth\, A. Trützschler\, M. Kiel\, F. O. Schumann\, J. Kirschner\, and W. Widdra\, New Journal of Physics 17\, 013035 (2015).\n[4]    C.-T. Chiang\, M. Huth\, A. Trützschler\, F. O. Schumann\, J. Kirschner\, and W. Widdra\, Electron Spectroscopy and Related Phenomena 200\, 15-21(2015).\n[5]     A. Trützschler\, M. Huth\, C.-T. Chiang\, R. Kamrla\, F. O. Schumann\, J. Kirschner\, and W. Widdra\, Phys. Rev. Lett. 118\, 136401(2017).\n[6]    M. Huth\, A. Trützschler\, C.-T. Chiang\, R. Kamrla\, F. O. Schumann\, and W. Widdra\, J. Appl. Phys. 124\, 164504 (2018).\n[7]     C.-T. Chiang\, A. Trützschler\, M. Huth\, R. Kamrla\, F. O. Schumann\, and W. Widdra\, Prog. Surf. Sci. 95\, 100572 (2020). \n  \nSpeaker Bio: Prof. Wolf Widdra is a Professor at the the Institute of Physics\, Martin-Luther-Universität Halle-Wittenberg\, Halle\, Germany. \n 
URL:https://qmi.ubc.ca/event/special-seminar-wolf-widdra-institute-of-physics-martin-luther-universitat-halle-wittenberg-laser-based-double-photoemission-spectroscopy-at-surfaces/
CATEGORIES:UBC event,Other seminars
ORGANIZER;CN="Aditi Adhikari":MAILTO:aditi.adhikari@ubc.ca
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