Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 28: Organic-Inorganic Systems I: PTCDA
O 28.2: Vortrag
Dienstag, 8. März 2016, 11:00–11:15, S054
Vibronic Modes in Molecular Orbital Imaging — •Achim Schöll1, Martin Graus1, Manuel Grimm1, Christian Metzger1, Matthias Dauth2, Christian Tusche3,4, Jürgen Kirschner4, Stephan Kümmel2, and Friedrich Reinert1 — 1Universität Würzburg, Experimentelle Physik VII, 97074 Würzburg, Experimentelle Physik 7, 97074 Würzburg — 2Universität Bayreuth, Theoretische Physik IV, 95440 Bayreuth — 3Forschungszentrum Jülich, 52425 Jülich — 4Max Planck Institut für Mikrostrukturphysik, 06120 Halle
Photoelectron momentum microscopy with high energy resolution allows imaging of molecular orbitals with resolution of vibronic modes. We demonstrate that the intensity patterns of photoelectrons derived for the vibronic sidebands of molecular states show characteristic changes due to the distortion of the molecular frame in the vibronically excited state. By a comparison to the simulated patterns derived from calculations, an assignment of the specific vibronic mode that preferentially couples to the electronic excitation is possible, which in the example of the HOMO of coronene is a b2u inplane mode with an energy of 0.2 eV. Orbital imaging by photoelectron momentum mapping with vibronic resolution thus provides unique information for the analysis of the coupling between electronic and vibronic excitation, and allows fascinating insight into the properties of molecular materials.