Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 55: Poster Wednesday: Organic Molecules at Surfaces 2
O 55.14: Poster
Mittwoch, 7. September 2022, 18:00–20:00, P4
Tip-enhanced Raman Spectroscopy of a lifted single PTCDA molecule — •Rodrigo Cezar de Campos Ferreira1, Jiří Doležal1,2, Sofia Canola1, Prokop Hapala1, Pablo Merino3, and Martin Švec1 — 1Institute of Physics,Czech Academy of Science;, Czech Republic — 2Faculty of Mathematics and Physics, Charles University; Czech Republic — 3Instituto de Ciencia de Materiales de Madrid; CSIC, Madrid, Spain
Advanced scanning probe techniques in the research of molecular adsorbates on surfaces have been instrumental in unveiling fundamental quantum phenomena with high sensitivity and spatial resolution at the nanoscale level. Such advances impact areas of molecular electronics, nanophotonics, and near-field spectroscopies. Tip-enhanced Raman spectroscopy (TERS) is a technique that provides access to vibrational modes of individual molecules via the extremely confined plasmonic field at the STM tip apex. This can be also used as a probe to chemically scrutinize single bonds with subnanometer precision. In this work, the STM-controlled TERS technique in a UHV environment at low temperature was performed for the perylene tetracarboxylic dianhydride molecule (PTCDA), in which we measured the Raman fingerprint for an array of PTCDAs on Ag(111) as well as for a single molecule. Moreover, we were able to simultaneously follow the conductance spectrum of the system while lifting a single PTCDA from the surface. The observed transition in the Raman spectra correlates with the differential conductance showing the transition of the system from S=0 neutral to S=1/2 anion state.