SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 72: Gerhard Ertl Young Investigator Award Competition
O 72.4: Vortrag
Donnerstag, 30. März 2023, 12:00–12:30, CHE 89
Submolecular-scale control of phototautomerization — •Anna Rosławska1, Katharina Kaiser1, Michelangelo Romeo1, Fabrice Scheurer1, Stéphane Berciaud1, Tomáš Neuman2, and Guillaume Schull1 — 1Université de Strasbourg, CNRS, IPCMS, UMR 7504, 67000 Strasbourg, France — 2Institut des Sciences Moléculaires d’Orsay (ISMO), UMR 8214, CNRS, Université Paris-Saclay, 91405 Orsay Cedex, France.
Photochemistry plays a central role in fundamental natural and artificial reactions such as photosynthesis, photocatalysis, or phototautomerization. Here, we demonstrate that using a tunable light source focused on a scanning tunneling microscope (STM) tip we drive and control the rate of a free-base phthalocyanine (H2Pc) phototautomerization with sub-molecular precision, providing a path to pilot the intrinsic reactivity of the molecule with an external controllable stimulus. In addition, we probe the excited state of the molecule, which drives the tautomerization, by recording tip-enhanced photoluminescence (TEPL) spectra and maps where varying patterns for non-resonant and resonant excitation conditions are observed. These TEPL maps reflect different atomic-scale coupling between the localized plasmonic fields and the transition dipole moment of the molecule influenced by the hydrogen switching process.