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arXiv · 1612.04653

Electrically-driven vibronic spectroscopy with sub-molecular resolution

Benjamin Doppagne·Michael C. Chong·Etienne Lorchat·Stéphane Berciaud·Michelangelo Romeo·Hervé Bulou·Alex Boeglin·Fabrice Scheurer·Guillaume Schull
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Abstract

A scanning tunneling microscope is used to generate the electroluminescence of phthalocyanine molecules deposited on NaCl/Ag(111). Photon spectra reveal an intense emission line at 1.9 eV that corresponds to the fluorescence of the molecules, and a series of weaker red-shifted lines. Based on a comparison with Raman spectra acquired on macroscopic molecular crystals, these spectroscopic features can be associated to the vibrational modes of the molecules and provide a detailed chemical fingerprint of the probed species. Maps of the vibronic features reveal sub- molecularly-resolved structures whose patterns are related to the symmetry of the probed vibrational modes.

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Benjamin Doppagne, Michael C. Chong, Etienne Lorchat, Stéphane Berciaud, Michelangelo Romeo, Hervé Bulou, Alex Boeglin, Fabrice Scheurer, Guillaume Schull. 2016-12-14. Electrically-driven vibronic spectroscopy with sub-molecular resolution. https://doi.org/10.1103/physrevlett.118.127401

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