SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 10: Organic Molecules on Inorganic Substrates II: Electronic, Optical and Other Properties II
O 10.3: Vortrag
Montag, 27. März 2023, 15:45–16:00, CHE 89
Tip-enhanced Raman Spectroscopy of a charged molecule — •Rodrigo Cezar de Campos Ferreira1, Jiří Doležal1,2, Amandeep Sagwal1,2, Sofia Canola1, and Martin Švec1,3 — 1Institute of Physics,Czech Academy of Sciences; Czech Republic — 2Faculty of Mathematics and Physics, Charles University; Czech Republic — 3Institute of Organic and Inorganic Chemistry, Czech Academy of Sciences; Czech Republic
The Tip-enhanced Raman spectroscopy (TERS) technique has been proven to unveil fundamental features of single molecules at the nanoscale level via near-field spectroscopy [1,2]. The confined light in the STM junction can be used as a probe to obtain an essential understanding of molecular structure and electronic properties. Here, the LT-STM-controlled TERS technique was performed and verified for the perylene tetracarboxylic dianhydride (PTCDA), which was measured the Raman fingerprint for a single molecule on Ag(111) and on insulating NaCl/Ag(111) from different excitation sources. Moreover, the precise control of geometry and charge state of the molecule in the system [3] can be observed together with the Raman fingerprint and revealed an abrupt change in the spectra. We correlate them to the presence of Kondo signature and discuss the implication for other systems.
[1] R. Zhang et al., Nature. 2013, 498, 82-86 [2] J.Lee et al., Nature. 2019, 568, 78-82 [4] M. Žonda et al., J.Phys.Chem.Lett. 2021, 12, 6320