Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 91: Scanning Probe Microscopy: Light Matter Interaction at Atomic Scales III
O 91.9: Vortrag
Donnerstag, 21. März 2024, 17:15–17:30, MA 041
Vibronically coupled excited states of asymmetric phthalocyanines from STM luminescence spectroscopy — •Sofia Canola1, Kirill Vasilev2, Fabrice Scheurer2, Alex Boeglin2, Fanny Lotthammer3, Frederic Cherioux3, Tomas Neuman1, and Guillaume Schull2 — 1Institute of Physics of the Czech Academy of Sciences, Cukrovarnicka 10, 16200 Praha, Czech Republic. — 2Universite de Strasbourg, CNRS, IPCMS, UMR 7504, F-67000 Strasbourg, France. — 3Universite de Franche-Comte, CNRS, FEMTO-ST, F-25000 Besancon, France.
Interactions between molecular excited states, mediated by vibrations, rule the internal dynamic of the molecular electronic structure following excitation. Information on these interactions can be accessed via the vibronic features of the spectra that arise from different mechanisms of coupling between the electronic excitation and molecular vibrations (e.g. Franck-Condon or Herzberg-Teller). In this presentation, I will discuss a systematic experimental and computational study of the vibronic properties for a series of related zinc (II) phthalocyanine derivatives employing electroluminescence in a scanning tunneling microscope (STML). The optical properties of phthalocyanines have been widely studied due their biological and technological relevance, but many fundamental aspects are still to be clarified. From high-resolution vibronic spectra and the associated spatially resolved light emission maps, we can selectively probe different mechanisms of vibronic coupling and access novel microscopic details otherwise not accessible to conventional spectroscopy.
Keywords: STM electroluminescence; phtalocyanines; molecular photophysics